I was wondering,if I had an expansion (7483),without the house (5302),could red tiles from 6220 or be put on the top of the expansion,in order to make something custom (providing that I had bought 3 sets 6220).Tiles are only one piece or separated in more pieces to be attached in many different buildings?It would be helpful if it was happened,because I want to buy 6220 x 3 to use the baseplates and walls in other constructions that they don't need the tiles.