Don,
Here are a few photos of my locomotive service area “in progress”... The roundhouse was built using IHC engine house kits, bashed over a wood frame of scale 24” timbers cut on a table saw.
The coaling/sand tower was scratch built by a friend. I added the chute/gate, sand pipe detail.
The control tower is an O scale ITLA laser kit I built with a custom Interior—gear kit.
The Roebling gon I painted an decaled on an Atlas gon—-hauling out scrap from the facility.
last but not least, the turntable is a Bowser, with a custom drive that my friend designed using off the shelf gears, motor, shaft <$100!