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If you measure carefully, and make use of a square and level, it is fairly easy to build a frame. The hard part is making it fit the body. I wouldn't get to exotic for a first effort, stick with a live rear axle, rather than IRS. Tack every thing first, and finish weld after you are sure that it fits with all the other systems involved. Building a sturdy frame table, even out of wood is a good idea. It makes it much easier to work on.
I have shortend a Mustang rack 3", to narrow a front end, I think you might be able to go 2" more if needed. You can't shorten a power rack though. As long as you maintain the same geometry on both sides as it had originally, shortening it through the middle doesn't hurt anything. You have to disassemble the rack, and cut the same amount out of the housing, and off the right end if the rack itself. Then the right end of the rack has to be remachined for the inner tie rod end. You might take a look at a Sweet racing rack, they are short, adjustable in length, and are available with power if you want it.
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