I've got to consolidating level 2 of the base.I have a locks sky blue 256m² prim just underneath the floor linkset. I find this clarifies a lot which prims belong to the current level. Each level has at least a floor and a wall linkset, and may need more depending upon what objects and props are on that floor.
Many of the floating items still there were casual omissions from f\previous level's consolidations. As soon as I finish a level I add 40m to the Z Axis of each linkset, starting with the wall one first. Most times it becomes obvious that I've missed a prim or two because they get left behind.
Others however, like the the advanced sliding and auto swinging doors, would be better being installed via a Buidler's Buddy connection. That's because the scripts that make them work rely on them in 3-4 prim linksets. Oops, I missed that issue!
