69 Camaro coupe cutting off the roof
 

I got a parts car a few months back. I am wanting to save EVERYTHING that is usable. Where do I cut the sail panel on the inside lower to save a very nice roof? I am wanting to keep brace support that goes to outer wheel houses. Would like to keep inner 1/4 window metal. Filler panel is good too. 1/4s, trunk floor, tail panel,LH frame rail are junk. Rear seat braces and wheel houses are rusted as well as floor. Already cut firewall cowl area off. Thanks sYc.