Brilliant!! Thanks very much. But I need to ask a question: Can projects be moved easily from one package to another or do I need to pick one platform and stick with it? In other words, is there a common format for wireframes and such?
And using google, I found a couple of wingnuts (oops, I mean, "ambitious automotive entrepreneurs") using 3d software to design
and build their own cars. Here's a guy who used 3d Studio Max
http://www.grabercars.com/Mambosite/index.php?option=com_content&task=view&id=15&Itemid=42
Seems he was able to convert the models to cross sections and then cut those sections out of wood. Then line up the wood bits and smooth out the bumps to form a plug. Way beyond me.

Here's a guy who used Rhino
http://www.statikdesign.com/scratchbuilt/design/models.html