As far as the buildings.... I have Ethyl's Gas station and O'Grady's Tavern, BUT... I think I'm actually going to try and make all of my own.
If you're making your own, presumably you have control over the lighting. That said, if starting from scratch I wonder if it's too bold to suggest making the leap to 12V DC accessory lighting bus - rather than old-school 14V AC and incandescent bulbs. So much easier to work with DC if using LEDs.
Also, I see you have your switches under AIU control. Curious if thought was given to putting Yard power and Uncouplers also under AIU control so that "everything" is controllable from the DCS remote.