Playing around with Fractional Accounting, it seems it doesn't cost that much more to drop a Savannah Master engine in a Ferret, and you get a little more armor. Cutting the MG ammo back to 25 shots also gets you a bit more. Enough, in fact, to take a Medium Laser from any direction and not explode. Of course, all that extra armor also jacks up the price.
SAW doesn't quite do Fractional Accounting right, but the cost is correct because Controls and Standard Armor cost the same. BV, not so much, but I'm not sure how far off it is. A 'slick' version could carry three tons of cargo internally, or eight tons slung at half speed (if they ever let VTOLs carry external cargo again; if it's back and I missed an errata, please let me know!).
Pole Cat (Standard)
Mass: 5 tons
Tech Base: Inner Sphere
Motive Type: VTOL
Rules Level: Experimental Tech
Era: Age of War/Star League
Tech Rating/Era Availability: D/C-E-D-D
Production Year: 0
Dry Cost: 76,806 C-Bills
Total Cost: 76,931 C-Bills
Battle Value: 86
Construction Options: Fractional Accounting
Power Plant: 25 Fusion Engine
Cruise Speed: 162.0 km/h
Flanking Speed: 248.4 km/h
Armor: Standard Armor
Armament:
1 Machine Gun
1 Infantry Compartment (1.0 tons)
Manufacturer:
Primary Factory:
Communications System:
Targeting and Tracking System:
================================================================================
Equipment Type Rating Mass
--------------------------------------------------------------------------------
Internal Structure: Standard 5 points 0.500
Engine: Fusion Engine 25 0.750
Cruise MP: 15
Flank MP: 23
Heat Sinks: Single Heat Sink 10 0.000
Control Equipment: 0.250
Lift Equipment: 0.500
Armor: Standard Armor AV - 22 1.375
Armor
Factor
Front 5
Left/Right 5/5
Rear 5
Rotor 2
================================================================================
Equipment Location Heat Spaces Mass
--------------------------------------------------------------------------------
Machine Gun FR 0 1 0.500
Infantry Compartment (1.0 tons) BD 0 1 1.000
@MG (1/2) (25) BD - 0 0.125
BattleForce Statistics
MV S (+0) M (+2) L (+4) E (+6) Wt. Ov Armor: 1 Points: 1
15v 1 0 0 0 1 0 Structure: 1
Special Abilities: