Mr. V., there is a case at CMC's site, to use with the RT with a car loaded. But the dimensions they give for the display case are really big. I want something with a "tight" fit. Using the dimensions of the truck that you guys provided, I think I'll commision a box of glass with 400 (L) × 200 (W) × 150 (H) mm in size. I don't want it to look as if I put an aquarium over the truck.
For the base, initially I thought about some polished Brazilian noble wood (imbúia, a dark brown hard wood common to my region is the 1st that comes to mind) or maybe something looking like asphalt. To do that I think of using black sand paper, but the problem would be how to cover the seams. You guys suggested buffed or brushed aluminum, and that also sounds nice. I just thought about using a mirror, that could also look cool.
I want the glass case to settle in a groove on the base (all four sides), but I don't think I can do this with all the ideas I wrote, specially with a mirror.