John, The plan looks like a good start. I'll leave suggestions for the yard and turntable area for others, since I never had the space to do either. Are you planning to use a double track bridge for the walkthrough opening on the right? It would be easier than bridges on two levels like I have. That means the grade from there to the first overpass would be pretty steep, though my 4% grades are manageable for the short trains I'll run. I'm thinking Dave is away on his trip to Georgia about now, so I don't know when he will be able to look at it. I never did get figured out how to setup grades on SCARM. He did it for me.
The blue walls look great! Yes some lighting around those ducts would help a lot. Are you going to leave the ceilings open, that is no drop ceiling? I see a lot of people who do that paint all the joists black so they aren't so noticable and it keeps the dust to a manageable level. I left my floor bare concrete. Are you going to do the same, or put in some floor covering? I may do something in the future, like the interlocking rubber mats in the walking area, but there is only so much money to work with.