That's the D-series frame, I'm making an eight door cuz why not. (I've made posts about it before in this thread)
Probably supposed to be like a Transformer. There was one of the Decepticons who was similarly themed, although my memory is a bit foggy because those movies are really old and I never payed much attention to them.
UV's work off perspective, not size. textures are automatically scaled to fit the UV in runtime for example your UV template is about 1024x1024 pixels right? if u scale the template up to 2048x2048, it will work, but with much better resolution (of course you'd have to re-do parts of the skin after being scaled)