Paul,
You might want to consider soda blasting rather than sand blasting. Much easier on the metal and no loose silica dust floating around. I know there are some good soda blasters in NC who specialize in automobiles. They will come to you, or you go to them. The only thing is, you will need to paint it immediately after blasting.
I'm NOT endorsing the folks at the link below, just found 'em on google so you have a place to start researching.
lake norman soda blasting Good luck!
Kurt
