Wow, thanks a lot for the explanation. I read through it a few times and spent some time really studying the pictures and it's starting to make sense. For the upper part of the Corvette suspension, you really only have to locate where those two bolts go so it looks like a plate is all that's needed. The vertical steel tubing that connects to the upper plate and then curves down would be the wheel center line, yes? The lower control arm location looks to take a bit more work but seems pretty straight forward. I didn't know what some of those other points on your jig were before but now see that they are the bolt locations for the rack and other parts.

I guess it's really important for the Corvette suspension to be in a neutral position before you start (neither suspended or compressed. How do you find out what the suspension angles should be at rest? Are they listed in a manual somewhere or do you crawl under a good Corvette and measure them?