Here's a "How To" on how I built a custom N scale 8" manual turntable:
http://www.yardgoatlayoutdesign.com/24.html 
I posted this as part of my Free-moN Staging Yard construction thread, but thought it'd be good to establish as its own thread for comments, search and archiving purposes.
[And really, how many people troll through a Free-moN construction blog in the hopes of finding one dude's way of building a turntable?]
Hope it comes in handy, and looking forward to seeing how other people built their turntables.
Cheers!