And another reason why I don't want to mod for BHD is because nobody cares about mods for it anymore. Hell, in fact, nobody cares about any DF mod anymore.
But good luck with the mod, mate.
Oh, and just some mod advice. It's kinda not good to skin existing items in a mod, because when it's released, if mappers wanted UN trucks, there wouldn't be UN trucks - only Nazi trucks. Anything you skin, you could consider re-skinning them (re-skinng = duplicating item + skinning it = totally new item).