are you saying you'd basically just roll a shell in and let them spray it? not having to take glass out and bodykit etc will prob save a bit of money. For a top notch job i reckon you would be looking at 1K to 1.5k depends on the paint etc ...lots of different factors involved.

For a Top notch respray from Scorpion in watford your looking at about 1500quid. that includes them removing and refitting any trim that needs to be done. But thats not a bare shell job.

HTH