You can make them out of either mild steel or chromemoly. The moly cage is a lot stronger and a lot lighter but it costs $$$$$$$$$$. standard diameter is 1 5/8" for a cage. (cant remember what wall thickness though. I wanna say .120 or .134 for mild steel)
you will also need access to a hydraulic tubing/pipe bender or preferrably a mandrel bender. gotta have at least a mig welder if not a tig.... a tape measure, a disk sander/grinder, a level, an angle finder, soap stone or sharpie marker, ummm what else........
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