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I'm not trying to discourage you, but all of this is why it costs thousands to have a pro do the work. It ain't easy!
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Mark knows what he's talking about! Not that I'm a pro, but this is another thing I've done (with help from Joe, of course) on a TR6 at the shop. Because if I did it myself I'd be the first to tell you the car would come out all lop-sided. But Believe me, this is not something you want to do yourself, unless you are quite good with a cutting torch and a MIG, and have lots of friends to help you. Redoing rockers is without a doubt the hardest and most challanging part of restoring a car.
One tip though if you do decide to do it yourself: Once you've got the doors off, weld an X brace with square steel tubing (about 1" will do) across each door, and then put another piece of steel longitudinally across the cockpit of the car, on top of each steel brace and then weld that in. It supports the car quite well and keeps it from sagging. Though we didn't do this particular 6 this way, Joe said he likes to turn the body of the car over (like a turtle shell) and cut them out that way, simply because it's easier than reaching into the car to do it. Once they are cut out, all the excess, jagged metal has to be removed, and this can't be done with a cutting wheel. Each spot weld has to be flexed back and forth with vice grips until it breaks free. The rockers and floor pans were spot welded in, so you'll have to drill about 100 spot welds out with a bit, without messing up the existing edge that stays there. THIS IS HARD AND TIME CONSUMING. If you drilled them all dead center the first time, this isn't to hard, but it is hard to drill them all dead center. Once that's out, the pans and rockers have the have all the flanges sanded down to metal and small holes punched so they can be welded back in. Once that's accomplished, they can be fitted in and held in with lots of vice grips, so they can be adjusted. Then the doors are put back on to check the alignment: you want all the gaps the same distance. THIS IS ALSO HARD. If the body of your car is warped or twisted even a minute amount (which isn't to uncommon), you'll have one heck of a time getting it right. The pans and rockers are then welded in, and then all of the little weld spots have to be dressed out: ground down and polished off.
Like Mark said, I'm not trying to discourage you if you really want to do it, but there is a lot of work involved, as you can see. I just don't want to see you start on it and A) Mess it up like I would or B) give up.