Jstraw, here is a layout plan with turnouts labeled, I hope that helps you.
With a larger space, it would be possible to do all O-72 turnouts, but would require some track plan revision work. You mention your space is also deeper, you might try for a larger center operating and access area. If you would like for me to create a revised layout plan and labeled track plan for a larger space, send me an email, and we can work something out.