Hi all! New member and new model builder here. I bought my grown daughter the Fairfield after finding out she always wanted one. She got really frustrated just doing the foundation so I started working on it. I got the chimney assembly done (I think its right) and the staircase BUT when I went to put the walls up...the second floor (right side) tabs DO NOT FIT in the slots where they are supposed too. Ive turned it every which way it could possibly go. The left side second floor lines up but not the right side. Help!!!!