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The only source I'm familar with for C6 roll bars in kit form for self install is Wolfe Racecraft in Ft. Worth.
Doing your own design and fabrication is very rewarding for both the cost and the sense of accomplishment. The difficult part is the main hoop. The rest pretty much falls into place.
I have a tubing bender and the material, the plans / specs would make the job much easier. All the store bought kits I have seen have been 800+ dollars for a 5 point bolt in.
FYI...I had a 5 point chrome moly with removable side rail custom built, painted and installed for about $1300. They built it to my specs(wanted the top to be fit in rear). They got it done in three days and it was exactly how I wanted it. The builder was "RACE CAR BUIDERS" located in South Florida (772-219-9917). I know he did not have any plans to work from but still did it record time.