Painting dilemma (long). What would you do?

You can staple plastic to rafters and then staple a 2x4 to the bottom to hold it tight. You really need to cover the ground if it's dirt. That's just asking for moisture and crap in your paint. A huge tarp under the car might work....

Box fans work great, but don't put them on the dirt floor. Maybe a few pieces of wood under the fan, filter the air going in to keep the dirt out. Also one fan pushing air in and one out. Make sure the one pushing air in isn't pointed at the car. Put it off to the side.

As for the prep... I agree with most, you need more research, the more you know, the better.

I don't have the ability plus I want a show car paint job so I ponied up for a complete paint job with body work.

RIddler