Here's a take on what I think the Firefly FFL-3Acould like. I peeled the ECM off along with a ton of LRM ammo and replaced it with a TAG, two more small lasers and fifth jump jet.
Firefly FFL-3A (Notional)
Mass: 30 tons
Tech Base: Inner Sphere
Chassis Config: Biped
Rules Level: Tournament Legal
Era: Age of War/Star League
Tech Rating/Era Availability: E/E-F-E-A
Production Year: 2790
Cost: 3,713,450 C-Bills
Battle Value: 871
Chassis: Earthwerks Firefly Standard
Power Plant: GM 150 Fusion XL Engine
Walking Speed: 54.0 km/h
Maximum Speed: 86.4 km/h
Jump Jets: Lexington Lifters Jump Jets
Jump Capacity: 150 meters
Armor: StarSlab/1x Ferro-Fibrous w/ CASE
Armament:
3 Martell Medium Lasers
1 Coventry Five-Tube LRM-5
2 Martell Small Lasers
4 Small Lasers
1 TAG
Manufacturer: Strana Mechty MechWorks
Primary Factory: Strana Mechty
Communications System: Datcom 18 with Guardian ECM
Targeting and Tracking System: Radcom TXX
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Equipment Type Rating Mass
--------------------------------------------------------------------------------
Internal Structure: Standard 51 points 3.00
Engine: XL Fusion Engine 150 3.00
Walking MP: 5
Running MP: 8
Jumping MP: 5 Standard
Jump Jet Locations: 1 CT, 2 LL, 2 RL 2.50
Heat Sinks: Double Heat Sink 10(20) 0.00
Heat Sink Locations: 1 LT, 1 RT, 1 LA, 1 RA
Gyro: Standard 2.00
Cockpit: Standard 3.00
Actuators: L: SH+UA R: SH+UA
Armor: Ferro-Fibrous AV - 105 6.00
Armor Locations: 4 LT, 1 RT, 5 LA, 4 RA
CASE Locations: 1 RT 0.50
Internal Armor
Structure Factor
Head 3 9
Center Torso 10 15
Center Torso (rear) 5
L/R Torso 7 11
L/R Torso (rear) 3
L/R Arm 5 10
L/R Leg 7 14
================================================================================
Equipment Location Heat Critical Mass
--------------------------------------------------------------------------------
TAG HD 0 1 1.00
Medium Laser CT 3 1 1.00
Medium Laser RT 3 1 1.00
Small Laser RT 1 1 0.50
LRM-5 RT 2 1 2.00
Medium Laser LT 3 1 1.00
Small Laser LT 1 1 0.50
2 Small Lasers RA 2 2 1.00
2 Small Lasers LA 2 2 1.00
@LRM-5 (24) RT - 1 1.00
Free Critical Slots: 1
BattleForce Statistics
MV S (+0) M (+2) L (+4) E (+6) Wt. Ov Armor: 4 Points: 9
5j 4 2 1 0 1 0 Structure: 1
Special Abilities: TAG, CASE, SRCH, ES, SEAL, SOA