I'm just getting back into the game again and I've just hit a thing that I was thinking about last time I played: setting up vault 88 as an SS2 settlement. My problem is that most, if not all, the plots will need to be interiors but the standard 1*1.5 doesn't cut it. Is there a way to inject 2*2 and 3*3 interior plots? I'd rather not just have 1*1.5 plots that spill over into other sizes.