SO im doing a slash project and i have a roller at the post office ( will post pics in near future) and i need some help. Kinda Lol

What wheels/tires should i use?
What body that will fit the slash thats a humvee?
And what other things will make it like a humvee and military like.

NOTE: I am also getting a towed artillery piece that shoots roman candles out. (Will also post pics.

Thanks for the help