Mechwarriors?

[RecruitMonty]

The icons would not be difficult to model per se. Just a question of scale. Only problem is you'd be short on space if you decided to have no turrets on these things.

As for the OOBs, well, I don't see why that should prove such a challenge either. How many of these things were you thinking of making anyway? If you intend to make hundreds of them then there might be trouble but a half dozen standard units (AA, AT and AP loadouts) should be no trouble.

Movement isn't a problem either. Just pick something light that already moves with superior cross country capabilities and you have it covered.

Post some more pictures of what you are thinking of please. I'll take a look and see if I can't make an icon or two. The reference materials have to be good though (technical drawings and anything close to top down is prefered).