Supra (Racing) Body Set came in..how do I put it to gether ? HELP :)

[DJ_Mo]

My package from HK came in...color tire set and the Toyota Supra Body set (Rally Racing). Its easy to clip the Supra body on my microsizer chasis, but where on earth does the rest of the parts go (the dark grey bottom chasis, a wheel set ??) ?

I thought I could make out the Japanese instructions with the pictures, but I am at a total lost.

Someone help :-D