Thank you everyone for the kind words, it means a lot!
To address some of the above comments:
I tried my best to avoid areas that would be problematic to easily reach. For the mainline table, there is nowhere that exceeds 3' in depth. The only areas that are tricky to reach are in the corners of the wall where the current hillside is built, but once scenery is completed I should have little reason to need to access that area again. For the tunnel underneath the mountain the benchwork is all open with only the surface directly under the track covered in plywood. If there should be a derailment, I can easily go under the table and pop up inside the tunnel.
I sadly don't have a real track plan of the layout, not quite sure how to use those fancy programs haha. But I can draw up a rough sketch on a piece of paper later this evening.
And the tentative plan is to cover that long back wall where the eventual town will be with building flats from PTF designs. I'm also contemplating adding a sky backdrop in that area as well.
Again thank you all for the comments!