On Hold Diflatsu Sese (Help Needed!)

Hello,

THIS MODEL IS NOT MADE BY ME. ALL CREDIT GOES TO IAC FROM THE SKETCHUP WAREHOUSE!

I have been working on a car mod for beamng recently and I've managed to get it into the game as a meshlap.
it has textures (most are working) but I need a bit of help with some things (especially the Jbeam, because BNeditor does not work for me)

issues that I don't know how to fix:



parts of the body are invisible from inside and outside



the steering wheel doesn't turn and the lights don't work.

Here are some pictures of the car so far:





here's a download for you guys to go ahead and fix it! (if you want) (also you may need to unzip it and put it in unpacked folder in mods)

 

the steering wheel doesn't turn because the model is one piece

 

To make it visible, the mesh needs to be "double-sided" which means that it has to have an inner & outer face. Otherwise, you'll get the same thing happening as you showed there

 

Yes, this is a bump, but how would I make the mesh double-sided? I like Japanese cars

 

Your best bet is the Solidify modifier. Just select it & then click on the Even Thickness & High Quality Normals in its options, change the thickness to what you want & off you go