Looking really good, Dave. I'm envious for your ability to expand significantly beyond the original door.
Couple of suggestions, which may be moot depending on your plans. First, add more lighting. Double or even triple what you've got, if you can, because areas of the layout are getting swallowed up in shadows. And second, get some sheets of foamcore, spray them light blue, and prop them up in the background while you're shooting. It will improve the images by reducing distractions--even though they're just construction documentation shots. This may provide some insight on what to do about yet-to-build scenic features, and give you ideas on where the best "formal" shots may be down the road.
BTW, I hope "Rail Time" isn't being abandoned.