It's not quite finished yet :-( but hopefully not far off as prom season is close! We have built a separate room with a large shower tray and shower and put in an extractor fan as it is on an outside wall - the type of extractor fans you have in bathrooms - there is also a small window. I am hoping that will be enough to remove the fumes etc ... I also hope overspray won't escape into the adjoining treatment room when the door is opened!
Sounds like it's coming along nicely. I'd be really interested to see how you get on. Please keep me posted.
Good luck with everything.