There's nothing stopping us from making smaller plots, is there? Like, keeping the helper's entry point where it is, and cutting it down to a smaller size, would let us go ahead and spawn in furniture and whatnot normally, wouldn't it? If the bed that gets placed is sheltered, the game doesn't care how the bed got there, it'll count as an "interior" bed.
I haven't even finished my first addon but I was thinking of making barracks-style bedding in a small 1x1 or so plot; got the idea the last time I was at the castle. There's that big empty room where a few beds already are, and yeah it's an annoying shape, but it would be amazing to lay down a grid of bed-plots and watch them become personalized. Random clutter could be used to vary things like open/closed footlocker, maybe room for a small side table to have random things appear on, etc.
Edit: duh, of course the giant 2x2 foundation piece that's actually placed would need to also be remade as a 1x1 or whatever. Could we do this entirely in the CK, or would we need to be editing models? For "barracks" style plots it might need to be smaller than 1x1, but the same idea could be applied to any sort of interior design.