I don't know the answer of your question, but can help here
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I have the (6-2-1) block car skin.
you just have to paste your texture on it.
it goes like this:
***********************************************
Detail.dds = sides of the block (stadiumcircuitD)
***you have to resize to an half ( 50% ) Diffuse.dds = top & bottom (stadiumPlatformD & stadiumWarpAuvent2D)
***********************************************
here's the skin
download car skin block 6-2-1PS:
you can even add a sound fx to the block by using "horn.ogg" 
so when they open they make a sound too !!!
I have already add a "big door opening sound".(horn)
some help
1rst2nd (not in english)2 nd took from herewikiDose!