Tony,
I was thinking about maybe adding "hoses" along the outside, sort of "Alien" like in the movies. If you have seen those from inside the ships and on the aliens themselves. Sort of like this pic. I have in the past thought of making an rc version of the aliens movie apc, but since I can't even finish my KT, I scrapped the idea lol. Oh and I just thought of this, use the smoke unit, but re-route the hoses so it comes out of the tank through different areas, almost like the tank is driving through fog all the time

and green lights
Cheers,
Wade