S&W sells pre-notched roll bar kits that fit great. I am not sure of the weight, but mine is 1 3/4" DOM steel. A six point will be fine w/ the side bars for the doors. Some people make it so that you can have swing out bars and some people weld them in solid so you have to crawl over them. I am not sure of the rules now, but swing out bars used to be legal. If you do weld the side bars, it will make the chassis stiffer than if they just swing out. You really don't need chromoly even though it is somewhat lighter and requires more skill to weld (TIG). The steel is fine and you can put it in w/ a MIG. I made up a removable back bar that I attach my harness to and it really isn't legal, but they usually don't hassle me about it at the local track. If you want it legal, it has to be welded in and that takes away your back seat for passengers. But I never have anybody sit in back so it is not an issue for me anyway. I just made it removable on the occasion that I wanted to let somebody sit back there. -Mike