A while back, I got rid of my plastic Heljan turntable and replaced it with a 14″ Bowser unit. I removed the plywood tabletop base that comes with the unit as the pit fit perfectly in the hole cut for the old Heljan unit. The motor runs way to fast on 12 volts so I cut the power down to about 6 volts.
For now, one of the roundhouse doors is operated with a Scale Shops turnout motor. An additional 6 stall roundhouse is being added to the scene with hours of scenery work remaining.