Hey there!
Looks like you know how to do good work. I think that the biggest thing on a resto of a '72 is that you are going to spend the same time and money as you would on a '70 or '71 model, but you still only have a '72. that's what I realized after getting started. On the other hand, the cost to get into a decent '70 or '71 keeps many people out! OK....so if you're good with that....
This is my most involved resto to date. I definately think putting the car on a rotiserrie is the way to go. I'll never do another car any other way again! That being said, to get the car on the rotisserie, you've got to completely strip it down, which is a LOT of work. Have the car blasted and get ready to see a LOT of rot you didn't think was there. If you're going to do it, do it right...so get out the cutoff wheels and the MIG welder and go to town. You will have a lot of metal to replace and you will have to fabricate a lot of pieces...trust me. Once you have the big metal work done and the car is stripped, get it in primer. Rust coatings like zero rust and POR 15 are designed for preservation and they're a good idea in the rust prone areas. If you aren't too concerned with correctness, you have a lot of leaway.
I think that most handy guys and gals can do the majority of the body work themselves assuming that they have the tools and the space and the time. You'll need a big compressor, a MIG welder, an assortment of air tools, a body hammer and dolly set, and a small bench brake. Sounds like you have most of that stuff. Also, read as much as you can on metal work. There are lots of good sites on the web just for that. Don't assume that body panels are readily available or that they are going to be easy to put on!
Good Luck!