Hi Mark and welcome to the forum.
I am a little confused as to how you intend using the available space in your 10' x 7' room. Are you saying that there will be a 3' wide "L" shaped board around two walls of the room with narrower boards around the remaining two walls to form the continuous loop? You mention using 10 ft wide sections but could that possibly be 10 inch?
Can you give us a basic idea of the type of station you are trying to create and also if you are modelling steam days or the modern scene? It might also help if you could post some of your ideas (no matter how rough
) as a starting point.