Hello All, My 2 year old daughter just loves her plastic train set. It's just a cheapo set. My plans now are to build her a real train set. I want to put a shelf at the top of her bedroom wall and have the train go around in circles around her whole room and possibly go through the wall into my future child's room and come back around. I am BRAND new to this and was wondering if HO scale would be best? The rooms are only 10 x 10 or so. Any thoughts?