I might be able to help.
1. The fumes from the oven really aren't that bad. I just put a box fan in the window for ventilation. Most ovens vent under the right rear burner.
2. You want to make sure all the parts have a good ground. When using my spray booth i hang the parts with wire and hook the ground up to that wire.
3. I just purchased a sandblaster from Harbor Freigh
http://www.harborfreight.com/cpi/cta...emnumber=47603. I paid $200 It could fit maybe a 15" wheel It was cheaper to buy then make from plywood. I have been using coal slag for the media. It works well.
good luck
Joe