I'll drop in a couple I like:
This one copies the style of the Achileus, and thus could even establish a FWL Battle Armor theme, with forearm weapon mounts and dual manipulators instead of a single claw. It has a heavier payload, more armor and also mounts an APWM, with nothing lost in comparison to other IS trooper designs. Notably, it can be equipped with a Support PPC or Medium Recoilless Rifle, giving it superior firepower than its competitors. For added flavor, a second APWM could be added to the left arm.
Classic BattleTech Battle Armor Technical Readout
VALIDATED
Type/Model: Longinus alternative A
(7 Configurations)
Tech/Era: Inner Sphere / 3067 / CBT Rules
Chassis Type: Humanoid
Weight Class: Medium Battle Armor (751 - 1,000 kg)
Rules: Level 2, Standard design
Ground Speed: 10.8 km/h
Jump Capacity: 90 meters
Armor Type: Advanced
==================================================================
Configuration: [Base]
Equipment: Slots Mass
Chassis Type: Medium Class Humanoid 0 175
Motive System: Ground Movement (1 MP) 0 0
Jump Jets (3 MP) 0 150
Armor Type: 10 Points Advanced 5 400
Manipulators:
Left Arm: Basic Manipulator 0 0
Right Arm: Basic Manipulator 0 0
Fixed Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Missile-Capable Modular Weapon Mount RA 1 10
Anti-Personnel Weapon Mount LA 1 5
------------------------------------------------------------------
TOTALS: 7 740
Slots & Mass Available for Configurations: 3 260
==================================================================
Configuration: Laser
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Small Laser RA/MWM-M 30 1 200
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 8 940
Slots & Mass Left: 2 60
Calculated Factors:
Total Cost: 472,750 C-Bills
Battle Value: 40 (160 for 4) Weapon Value: 19 (Ratio=.48)
Cost per BV: 11,818.75
Damage Factors: SRDmg = 1 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: 1/-/- Overheat: 0
Point Value: 2 Specials: mec, car4
==================================================================
Configuration: Flamer
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Flamer RA/MWM-M 10 1 150
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 8 890
Slots & Mass Left: 2 110
Calculated Factors:
Total Cost: 469,000 C-Bills
Battle Value: 35 (140 for 4) Weapon Value: 15 (Ratio=.43)
Cost per BV: 13,400.0
Damage Factors: SRDmg = 1 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: 1/-/- Overheat: 0
Point Value: 1 Specials: mec, car4
==================================================================
Configuration: MG
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Machine Gun RA/MWM-M 50 1 100
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 8 840
Slots & Mass Left: 2 160
Calculated Factors:
Total Cost: 467,500 C-Bills
Battle Value: 34 (136 for 4) Weapon Value: 14 (Ratio=.41)
Cost per BV: 13,750.0
Damage Factors: SRDmg = 1 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: 1/-/- Overheat: 0
Point Value: 1 Specials: mec, car4
==================================================================
Configuration: SRM
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
SRM 1 RA/MWM-M 4 2 100
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 9 840
Slots & Mass Left: 1 160
Calculated Factors:
Total Cost: 467,580 C-Bills
Battle Value: 37 (148 for 4) Weapon Value: 28 (Ratio=.76)
Cost per BV: 12,637.3
Damage Factors: SRDmg = 2 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: -/-/- Overheat: 0
Point Value: 1 Specials: mec, car4
==================================================================
Configuration: PPC
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Support PPC RA/MWM-M 14 2 250
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 9 990
Slots & Mass Left: 1 10
Calculated Factors:
Total Cost: 468,500 C-Bills
Battle Value: 47 (188 for 4) Weapon Value: 26 (Ratio=.55)
Cost per BV: 9,968.09
Damage Factors: SRDmg = 1 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: 1/1/- Overheat: 0
Point Value: 2 Specials: mec, car4
==================================================================
Configuration: Recoilless
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Medium Recoilless Rifle RA/MWM-M 20 2 250
(with High-Explosive Ammo)
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 9 990
Slots & Mass Left: 1 10
Calculated Factors:
Total Cost: 465,100 C-Bills
Battle Value: 55 (220 for 4) Weapon Value: 33 (Ratio=.60)
Cost per BV: 8,456.36
Damage Factors: SRDmg = 2 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: 1/1/- Overheat: 0
Point Value: 2 Specials: mec, car4
==================================================================
Configuration: Gauss
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
David Lt Gauss Rifle RA/MWM-M 20 1 100
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 8 840
Slots & Mass Left: 2 160
Calculated Factors:
Total Cost: 484,250 C-Bills
Battle Value: 37 (148 for 4) Weapon Value: 17 (Ratio=.46)
Cost per BV: 13,087.84
Damage Factors: SRDmg = 1 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: -/-/- Overheat: 0
Point Value: 1 Specials: mec, car4
Created by HeavyMetal Battle Armor
This version reduces the armor to the same levels as the other IS trooper designs and swaps the manipulators for a single Vibro-Claw, exchanging superior protection for superior melee capability, although I must admit I prefer the idea of the latter for a redesigned Raiden instead. The configurations would be identical to the above, so I've only included the Small Laser. Unlike the above design, a second APWM couldn't be added since that would disallow the PPC and Recoilless Rifle configurations.
Classic BattleTech Battle Armor Technical Readout
VALIDATED
Type/Model: Longinus alternative B
(1 Configurations)
Tech/Era: Inner Sphere / 3067 / CBT Rules
Chassis Type: Humanoid
Weight Class: Medium Battle Armor (751 - 1,000 kg)
Rules: Level 2, Standard design
Ground Speed: 10.8 km/h
Jump Capacity: 90 meters
Armor Type: Advanced
==================================================================
Configuration: [Base]
Equipment: Slots Mass
Chassis Type: Medium Class Humanoid 0 175
Motive System: Ground Movement (1 MP) 0 0
Jump Jets (3 MP) 0 150
Armor Type: 9 Points Advanced 5 360
Manipulators:
Left Arm: Battle Vibro-Claw 0 50
Right Arm: None 0 0
Fixed Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Missile-Capable Modular Weapon Mount RA 1 10
Anti-Personnel Weapon Mount LA 1 5
------------------------------------------------------------------
TOTALS: 7 750
Slots & Mass Available for Configurations: 3 250
==================================================================
Configuration: Laser
Config Weapons & Equipment Loc Shots Slots Mass
------------------------------------------------------------------
Small Laser RA/MWM-M 30 1 200
(Anti-Personnel Weapon Space) LA/APWM 0 0
------------------------------------------------------------------
TOTALS: 8 950
Slots & Mass Left: 2 50
Calculated Factors:
Total Cost: 465,250 C-Bills
Battle Value: 38 (152 for 4) Weapon Value: 18 (Ratio=.47)
Cost per BV: 12,243.42
Damage Factors: SRDmg = 1 MRDmg = 0 LRDmg = 0
Mechanized: Can travel on OmniMechs and OmniVehicles
Attacks: Can perform Swarm and Leg attacks
BattleForce2: Class: IB MP: 3J Armor/Structure: 2 / 0
Damage PB/M/L: 1/-/- Overheat: 0
Point Value: 2 Specials: mec, car4
Created by HeavyMetal Battle Armor