To my knowledge, half cages will shortly not be able to get a CAMS logbook. (Requirement if you're going to do any serious racing.)Get a CAMS manual and build it to that. You can also get further info if required out of CAMS. Once again, if it's going for a logbook, the manufacturer has to fill out a form stating all material specs and certify that it complies to specs. CDS is a bitch to bend, and unless this guy has some serious equipment, and knows what he's doing, take it to a cage builder and get it done by someone who does them everyday. I did, because I know what my life is worth.