I would think many of the great housing mods already fit (more or less) your description. Although saying that, creating a housing mod like this would be rather easy. Keeping it script free, with no amazing features. You could make named chests near your smithing, enchanting etc rooms for your stuff like ingots and ingredients. So you know where stuff is and knowing what is kept inside without looking inside. As for a trigger to allow NPCs to become nude while in some kind of pool would need a script (I would guess) But taking a good look at the top housing mods would be a good start!