Michael,
Your progress is great and the backdrops look very nice. I may have to consider that for some areas of my new layout.
I have a question, please forgive if this has already been explained. I struggle to understand the attraction to foam board, so my question is this.
I see you are laying cork right on the foam and it appears most trackage will be level at that elevation. So what is the advantage of the foam? What purpose does it serve different from plywood or homasote?
I see it looks like you have osb board under the foam, cost and effort it seems to me homasote or simply better plywood would do the same job?
Just trying to understand?
Sheldon