I forgot to mention one basic method -- you need to model half (left or right side) and make it a component. Then insert a copy, mirror it and position it precisely. So when you edit something on one side, you see the other half changing at the same time.
I will see if I can try the CarBEN EV model on a machine with 1024MB of video RAM and Win7. My personal machine is an iMac 24", so I am unfortunately stuck with the 256MB ATi video.
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