RE: graphite or aluminum
Ok!
Now were talking! I'm also developing a all carbon 1/8 buggy chassis. Rado, have you ever tried to vacuum bag your chassis in a mold? This is one way you can create custom shapes and control the stiffness of your chassis. Also, you may want to look into honeycomb sandwich layup to save some $ on the carbon. I can see were your cost of materials is high if you are building up 4 or 5mm of solid carbon. Ouch.
Another interesting idea is to lower the cars center of gravity. Using a mold technique will allow you to lower the engine as well as the fuel tank....Hmmmm. This would be a difficult engineering task with aluminum stamping. Cool stuff!
Just because the Pros aren't using a carbon chassis dosen't mean they won't. Hint Hint....
Dr. Van
Dr.Van