A-Body Frame/Body Jig

I was wondering if anyone knew of an A-body body/frame jig that anyone has made or any plans that anyone is aware of. I have a '68 project Dart that I'm getting in kind of deep on. I found a rotted front frame rail on mine and started trying to figure out how to replace it. I bought a set of rails with a torsion bar crossmember that a forum member here sold me. There ended up being a few cuts when it was removed from the donor car that I didn't like so I bought a better clip with the inner fenders still attached that was removed much more cleanly from its donor. I think I can figure out how to get the front clip removed from my car and get the new one lined up and installed, but then I found a nice set of rear frame rails that I'd like to replace the rails on my car that had been capped.

The reason I'm asking about a jig is that I've seen the Camaro guys building them for the first gen Camaros and there are a lot of drawings and documentation on the internet about how to build them, dimensions, etc. I've also seen some good Mopar B-body jig pictures on the internet but haven't seen anything on A-bodies. I looked at the chassis dimensions in my '68 Dodge service manual but the drawings are not that great and it's kind of hard to tell exactly where the dimensions are referenced from, I'm assuming there's some locating holes and such that were used in the original factory jigs that must be used as reference points.

Maybe A-bodies just aren't worth the effort yet or people are keeping their A-body jig plans secret. I'd really like to know if anyone knows of plans that might be for sale. If not, maybe someone has built one and can give out a few tips.

Thanks for any input.