Can't remember exactly but about £600-odd for the stark b0ll0ck naked shell to be blasted and etch primed inside and out. And that was a 200SX so I'd imagine a Punto would be a bit cheaper.
I need to pop in tomorrow if he's open, I'll get a price for mine and let you know. It's literally ten minutes away form me. Biggest issue is finding somewhere indoors to completely strip my shell, putting the subframes etc back on so its rolling, getting it transported, then stripping the wheels etc back off again!