WOW Chris...
Your collection of trains is awesome. I like what you are doing there. I also am planning on a complete rebuild once my new house is built. I will have a wide open basement measuring 30 X 62 with a bump out of 23 X 18.
I am only dreaming of what I am going to do with all that space.
I am also going to finish all the outer walls and the floor first.
Keep us posted as you go along.
Brian