>>9543702Overall the playset is pretty modular, but not nearly as much as I'd like.
I tried to make a short full hallway using the two wall pieces and bulkhead piece, but the tabs for the floor don't align with the 2nd wall piece with the bulkhead. If you want a full hallway you'll need to buy a 2nd set and use the same wall section as the other side.
Here you can see the holes to store the foot pegs. I don't reccomend using them, though, since 2 already fell out.