Lol I'd missed a final answer had been given and didnot notice the later questions, anyway just rethinking on this old one.
I had come up with a different answer, but I had taken the premise each room has 4 walls that have to be covered? you seem to be working with just 3 walls, are you discarting the wall with the door or with the windows? what if I have windowless rooms, or doorless or both
Anyway I came up with 2408 covering all 4 walls but leaving 1 bust left per wall, couldnot get it too work assuming only one got left.
I feel strongly I deserve a consolidary sculpt by TC, preferably not sculpted in his toilet