Hi ASYMAIR95,
Some other considerations:
- The knee wall height is higher than the window sill height -- going to the highest point where the slope starts decreases use of table top for train clearance-- I would suggest somewhere between to two heights or just below the window sill. Can you hang the AC units in the top sash?
- Speaking of the windows--that table may have to more narrow than the rest -- you'll need access to the windows
- It's appears that the long wall has the heat unit-- that table should stand away from the wall to permit good convection--floor to ceiling air flow
- Electrical needs--are the receptacles for this area on their breaker in the electrical panel? Are the receptacles on one circuit or separate circuits? Are any of the receptacles switched on/off by a switch near the door? Having clean power and the ability to power the layout on/off at the door are good options
- Are you satisfied with the lighting?
I would paint what ever vertical wall is exposed and the ceilings in Sherwin-Williams Tibetan Sky - it is a very light blue - like the color of the horizon over the tree tops on a sunny day- it shows less blue when brightly lit and slightly darker in dimmer light. It is actually a white with a touch of blue.
I don't see any need to do the end walls. You may want to paint a scene or put backdrop photos there.
You'll also need a visual block for AC unit(s) in the windows. They are what they are, a necessity, but if you hide them in any way, it will look better.
here's a concept for the U shape with an allowance for the baseboard connector. The grid is 6" blocks.
I can see the long corner being good for a yard/engine storage and using Gilly's thoughts. if you give me a few measurements and some clarification on track inventory, I can put together a track plan concept to start you off. 30" wide tables except for the window end and the turnaround ends near the door. 24" in front of the windows.
