I built a sandblast booth just for my restoration and it was worth it. Bought a large Craftsman oil less air compressor. I think it was
http://www.skatblast.com that had the drawings to build it out of plywood but it turned out awesome. It paid for itself within a year when I put it out on Craigslist and started doing small parts in the area. It even has a vacuum system built in to my shop vac.
If you do work on your own car then I would recommend it for anyone. I have used it for tools for neighbors and even a neighbors son bike frame and got a month of mowing free.
The Black Diamond cutting abbrasive works fast.