This is my “pit-bash” of an HO-scale Atlas turntable:
I did a photo-essay on the project, which our hosts have been kind enough to keep available:
http://cs.trains.com/mrr/f/88/t/99558.aspx?PageIndex=1
It was a long and time-consuming job, but it ended up, as usual, teaching me new things. It was built in 2007 and is still running just fine.