[Wauthan]

I used the #shapechange command, with no #firstshape or #secondshape, to simulate a catapult type unit that needed to be assembled before being usable.

Assembled shape -> immobile, with powerful multiboulder attack
Disassembled shape -> mobile, but low hp and weaponless.

This meant that it could not be used as an offensive weapon since couldn't fight in the shape that allowed it to move. The multiboulder attack also caused massive friendly fire. It was great at siege battles though, both on the offense and the defense.

I scrapped the unit though since the AI couldn't use it.

I agree with Karlem that a series of secondshapes is a good simulation of a successively more damaged siegeweapon, or similar construct. I think Sombre made something like this already in his Ogre Nation mod.

All in all I don't think it would be hard to implement warmachines at all, considering how powerful mod tools have become. Heck, the Ulm Arbelestier is a sort of mini siege weapon. Makes sense that Ulm would have a "Big Bertha" type unit that's derived of the arbalest.