Zapped-
what about next time ? Yes next time ! you stated this is a model home. people will see this (if not pointed out to them)and they will have to have it also . sounds like a can of worms. DO NOT COMPLETE this installation. Go back and undo any and all wiring and have the sheetrockers mud the hole shut. The boss or contractor can not do anything about it, because they will be pushing YOU to do something wrong. Be smart and do it right. Explain to the boss that it is illegal and you want no part of it, if he insists you do this work say no- might cost you the job but do you want to run the risk of killing some one.
Like I said ... Be smart and do it right