I’ve gotten some very good info from everyone and finally started my ceiling layout. I wanted to be able to run two trains and also be able to run the larger articulated steamers so one loop will be O72 and the outside (upper) loop will be O81. I have the track down to test the lower loop but won’t be able to lay the upper track until the shelf is permanently mounted. Now that I’ve tested it and know it works I get to take it all down and sand/finish everything.
As always any feedback is appreciated.