Todd,
The Silver State Classic is where you start to test the line between PT and a race car. Unless you get a waiver, you have to run the 110 mph class the first time out (tech to 124 mph). After that, things like window nets (or arm restraints), HANs devices, and five or six point harnesses become manadatory. To get teched to go fast in the upper classes, you run into cage requirements that have specs for things like the number of bends in the front and rear hoops, diagonal brace specifications, etc.. A 1.75 inch / .120 wall full cage (if DOM) is required for cars over 3000 lbs. The complete rule book is available on line. I sleep with the SCCA, NASA and Silver State rule books under my pillow and it results in sleepless nights and a "never quite finished" car. There are a lot of compromises to keep the car streetable and race legal, without even considering comfortable. I just spent two months putting a mandatory metal firewall between the fuel cell and the passenger compartment (last year's rule), and now it reads "metal (steel or aluminum) PREFERRED". Good luck -- I'll come out cheer you on.
Pappy
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