This is my NEW Engine House. I completely remodeled it. It is much easier to print and assemble. If you tried to assemble this model before, you came across a serious problem. Once you laid track in front of the doors, they couldn't open. This one will require an 8" printing table. Everything turned out great...but I couldn't figure out a good way to install the posts in the middle. The rafters print with the roof. I attached the posts to the rafters before I installed the roof, and let the posts float just above the floor. Yeah there are holes for the posts but I didn't use them. I left them in case you come up with a better plan. Other that that...I am really happy with the model