I posted earlier and am just about out of time for research. I am starting Friday night. how about a flip up with a 31 x72 board max 30 inches high but I can be wrong. I measured without the towers in place yet. I also have around 11 inches towards the wall studs of open space for a roadway. I am also securing the buildings with wood pegs and liquid nails into 1 inch foam. does anybody think a flip up would work and have adequate clearance? I also suggested file cabinet slides vertical on the wall for a up and down motion. 31 to around 50 inches of height. I was wondering again has anybody had success with these ideas this is very important and costly if a mistake is made. by the way this is a walthers electric furnace,blast furnace and coke retort and a electric producer and yard plus towers. max 30 to 35 inches high and 22 wide at the biggest points. I have a ton of time invested and the rest came from swap meets and gifts.