Should I reassemble before painting?

Since nobody answered in the forum specifically designed for questions like this, I'll ask it here.

So I'm gonna start dissasembing the interior in preperation for my complete color conversion. My question is....the front end is dissasembled right now. Can I bolt the fenders and front end back on before painting? Is that a bad idea?? it would make my life a lot easier if I did, but if the fenders and front end should be painted separately, I'd leave them off. I'm taking this to a body shop to get the actual prep and paint work done. If I put the fenders and front cover back on, will that have a negitive effect on my paint job?

What have you guys done?

Thx.

Yeah, I can understand painting the urethane parts separately. I may end up doing it that way. The rear is already off (replacing w/ Cobra rear) and I don't have side skirts at the moment. So maybe I'll just bolt the fenders back on and leave the rest for later. Thx dude.