Super heavies... One of my favorite types of units... They have ork written all over them! In my personal collection I have three (pics incoming): Mork's Mighty Manger (Gargant), Da Fist a'Gork (Skullhamma), and Da Dakka Wagon (looted Stormlord, great for running lootas and flash gitz out of).
The two regular superheavies use the GW rules, but for the gargant, I had to go to player made rules. Here is a nasty set of rules I used for it once!
Mork's Mighty Mangler
WS BS S front side rear I A SP
4 2 10 14 13 13 1 3 12
Structure Points: 12
Energy Shields: 8
Weapons and equipment:
Mega-deth kannon with co-axial megagigashoota
Deff Aresenol (see apoc book)
Mega supa-skorcha (Special)
5 big shootas (see apocalypse book)
5 supa rokkits (see apocalypse book)
Weapon range str ap special
mega deth kannon 108" 10 1 ordnance D3, 10" blast, primary weapon
mega supashoota 72" 8 3 heavy 8D6, co-axial
Mega Supa Skorcha, Hellstorm, str 7, ap3
Deff Arsenol (As per rulz)
Eiffgy: 18 in.
Mega 'Uge: all weapons have a minimum range of 18"
Rolling Behemoth: Driver cannot be stunned
Good times... Was doing well until it was blasted to smithereens by a Warlord Titan! Course, not before it outflanked behind a line of leman russes and proceeded to unleash hades, blowing up a Warhound titan cause it to go nova and kill a bunch of the tanks... Then the remaining weapons finished off a ton of them... In the end, It killed about 10 tanks, a bunch of guardmen, and the warhound... Thay brought the wraith of the Emporer Class Titan!