Here's a painting tip for ya Mike, before you spray make sure you ground the body and the booth you built. Doesn't have to be fancy, a piece of wire in the ground pole of a wall outlet with an alligator clip on the other end to clamp onto a screw/bolt.
As the air flows across the car/plastic of the enclosure it will build static and suck every piece of dirt into the paint without it.
Good luck, I hope it turns out great.