Well my thinking was I want to randomly generate one large long level a little bit like the way the Binding of Isaac puts random rooms together. So I'd take each room that I've designed & downloaded then put it in an array the size of each room (30x17) then put that into a larger 'level array' one next to each other how ever many times to make the one long level.
I guess I could always just create multiple tilemaps & use the former method of loading for each room though now that I think about it.
I'm probably trying to overengineer it & make things way more difficult for myself that need be, my speciality :)