Good luck with this part of the process.
In my case, what was once sold (to me) as a rust free car, this process revealed the true condition of the car.
The guy who did my media blasting used a plastic media. He appeared a bit concerned how I would respond after I got the car back from him. It certainly looked much rougher than when he took it but not nearly as bad as others have experienced. He applied a epoxy primer only to the steel. All aluminum came back bare metal and even had some bondo still on it because he did not want to hit it any harder. Even though I contracted separately with the Media Blaster, the body shop was satisfied with the result of the work since they also take their cars to the same guy. The body shop handled the bondo removal and have since completed all metal and body work.
Good luck again. This will give you a good idea of what the body work will cost and in my opinion, the best way to approach a restoration on these cars.
I see you had the same idea with building a dolly. In my case, the media blasting guy placed it on backwards but it did not matter much.
