Just experimenting around a bit with light PPCs and single heat sinks:
Shadow Hawk SHD-2K2
IS TW non-box set
55 tons
BV: 1,227
Cost: 4,842,407 C-bills
Movement: 5/8/3
Engine: 275
Heat Sinks: 18
Gyro: Standard Gyro
Internal: 91
Armor: 152/185
Internal Armor
--------------------------------------
Head 3 9
Center Torso 18 23
Center Torso (rear) 8
Right Torso 13 18
Right Torso (rear) 6
Left Torso 13 18
Left Torso (rear) 6
Right Arm 9 16
Left Arm 9 16
Right Leg 13 16
Left Leg 13 16
Weapon Loc Heat
----------------------------------------
Light PPC LT 5
Light PPC RA 5
Light PPC RT 5
Equipment Loc
----------------------------------
Standard None
Standard None
Along with it, a more extensive mod, with ferro-fibrous armor and double heat sinks, that goes a big bigger on its main gun:
Shadow Hawk SHD-2K3
IS TW non-box set
55 tons
BV: 1,575
Cost: 5,281,057 C-bills
Movement: 5/8/5
Engine: 275
Heat Sinks: 13 [26]
Gyro: Standard Gyro
Internal: 91
Armor: 170/185 (Ferro-Fibrous)
Internal Armor
--------------------------------------
Head 3 9
Center Torso 18 25
Center Torso (rear) 8
Right Torso 13 20
Right Torso (rear) 6
Left Torso 13 20
Left Torso (rear) 6
Right Arm 9 18
Left Arm 9 18
Right Leg 13 20
Left Leg 13 20
Weapon Loc Heat
----------------------------------------
Heavy PPC LT 15
Light PPC RA 5
Had to add the head armor by hand. No idea why MegaMekLab leaves that off when exporting to clipboard.