If not bird, then why bird shape?
Stuck with the Roc, taking the Roc 2, which is on the Raven's list all the way through to the ilClan era, dropped the heavy medium laser, and replaced it with a standard IS medium laser, a Clan light active probe, and a Clan MG with 20 rounds/bursts of ammo. That left me 150 kg I could use to tack a point of armor back on to the head, torso and legs.
Roc 2b
Mass: 7 tons
Chassis:
Power Plant: 60 Fusion
Cruising Speed: 54 kph
Maximum Speed: 86.4 kph
Jump Jets:
Jump Capacity: 150 meters
Armor: Standard
Armament:
1 ER Medium Laser
Manufacturer: Unknown
Primary Factory: Unknown
Communication System: Unknown
Targeting & Tracking System: Unknown
Introduction Year: 3080
Tech Rating/Availability: F/X-X-E-D
Cost: 886,200.75 C-bills
Type: Roc
Technology Base: Clan (Standard)
Tonnage: 7
Battle Value: 311
Equipment Mass (kg)
Internal Structure 700
Engine 60 1,500
Walking MP: 5
Running MP: 8
Jumping MP5 500
Heat Sinks: 5 1,250
Cockpit: 500
Armor Factor: 21 1,050
Internal Armor
Structure Value
Head 2 2
Torso 7 6
R/L Arm 2/2 3/3
Legs 4 4
Main Gun 1 3
Weapons
and Ammo Location Mass
Light Active Probe T 500
ER Medium Laser MG 1000
Alternatively, I also came up with this, which I see as being an oversized flying "Roc II", as it's a Glider ProtoMech twice the mass of the Roc:
Badhbh Glider ProtoMech (Standard)
Mass: 14 tons
Power Plant: 85 Fusion
Cruising Speed: 54 kph
Maximum Speed: 86.4 kph
Armor: Standard
Armament:
1 ER Medium Laser
2 Machine Gun
1 LRM 5
Manufacturer: Unknown
Primary Factory: Unknown
Communication System: Unknown
Targeting & Tracking System: Unknown
Introduction Year: 3080
Tech Rating/Availability: F/X-X-E-E
Cost: 1,478,247.5 C-bills
Type: Badhbh Glider ProtoMech (Glider)
Technology Base: Clan (Advanced)
Tonnage: 14
Battle Value: 600
Equipment Mass (kg)
Internal Structure 1,400
Engine 85 2,500
Walking MP: 1
Running MP: 1
WiGE Cruise MP: 5
WiGE Flank MP: 8
Heat Sinks: 5 1,250
Cockpit: 750
Armor Factor: 71 3,550
Internal Armor
Structure Value
Head 4 9
Torso 14 28
R/L Arm 4/4 6/6
Legs 8 16
Main Gun 2 6
Weapons
and Ammo Location Mass
LRM 5 Ammo (12) BD 500
Machine Gun Ammo (110) BD 550
Recon Camera T 500
LRM 5 T 1000
Light Active Probe T 500
Machine Gun LA 250
ER Medium Laser MG 1000
Machine Gun RA 250