If you are not that headstrong on the ActionButler's scheme, it can be turned into a reasonable 'Proto:
ProtoMech Technical Readout
VALIDATED DESIGN
Type/Model: MiniPiranha
Tech: Clan / 3060
Config: sProtoMech
Rules: Level 3, Standard design
Mass: 9 tons (9,000 kg)
Chassis: Advanced Composite
Power Plant: 75 Size Fusion
Walking Speed: 54.0 km/h
Maximum Speed: 86.4 km/h
Jump Jets: 5 ProtoMech Jump Jets
Jump Capacity: 150 meters
Armor Type: Integral Advanced Alloy
Armament:
2 Machine Guns
2 Medium Chemical Lasers
Manufacturer: Unknown
Location: Unknown
Communications System: Unknown
Targeting & Tracking System: Unknown
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Type/Model: Tommy Gunn
Mass: 9 tons (9,000 kg)
Equipment: Mass, kg
Int. Struct.: 21 pts Advanced Composite 900
Engine: 75 Size Fusion 2,000
Walking MP: 5
Running MP: 8
Jumping MP: 5
Heat Sinks: 0 Compact ProtoMech 0
Cockpit, Life Support, Sensors & Pilot: 500
Armor Factor: 38 pts Integral Advanced Alloy 1,900
Internal Armor
Structure Value
Head: 2 6
Torso: 9 15
Main Gun: 1 3
Left/Right Arms: 2/2 2/2
Legs: 5 10
Weapons and Equipment Location Heat Ammo Mass, kg
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1 Medium Chemical Laser Torso 0 11 1,375
1 Medium Chemical Laser Torso 0 11 1,375
1 Heavy Machine Gun Left Arm 0 15 650
1 Heavy Machine Gun Right Arm 0 15 650
JumpJets: 5 - 100 kg 500
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TOTALS: 0 9,000
Mass remaining, kg: 0 left
Could use more ammo, though.