somebody actually did bring up the 4-leaf issue in a later comment, but didn't understand it himself, and the reply that he got is so way off base as to be in another universe!
It is undoubtedly a 4-leaf system, as John pointed out it isn't even insulated, and it will most likely have really lousy isolation in the low end. I hope the poor guy doesn't plan to record drums or bass in there!
I was going to post a comment, but then I decided that Javier is right: let sleeping dogs lie. If the guy couldn't be bothered to do the research before starting to build, then he sure as hell won't want to hear about it now.
( It looks like his ceiling is hung on plain old hat channel, too. That doesn't seem to be RC... )
- Stuart -