Not very far in Calif. 3pt belt is required but you can have a harness as long as it is not used on the street. They get real sticky about roll cage padding in the passenger area. It must pass a certification. Windows are ok for sure. I have been upside down hanging from the straps before so I would keep the stock doors and bumpers for safety reasons. Look at some of the Boxster spec builds to see what they are doing.
You are right that shedding weight is the fast track to performance.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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