remember the Chaos Doomwheel? my friend David is a Chaos nutcase, he wanted to have one so i obliged and made him one that evening. cost him 25 quid (roughly $50)
he wanted me to make him just the basic body shape, so thats just what i did:

and a scale shot..
he is making it into a nurgle doomwheel, so is currently moulding all kinds of icky stuff onto it.
when he's finished il get some pics of it finished.
for rules he'll count it as a fast super heavy with moving restrictions. it will have 14 armour all round and 2 structure points. counting as open topped on the sides to reflect it being knocked over. it will have 2 twin linked assault cannons on the side sponsuns and the main bulk will count as a titan CCW.