Hi Joe,
The limiting factor is that the O31 curves won't sit inside of O36. So the table width is good to enable spreading the width. A 5' x 12' walk-around is nice.
Have you performed a search of the forum for "5 x 12" or "5 x 12 layout" for some ideas?
I thought of the 5' x 9' Lionel Dealer display layout that was for super O for the FasTrack. Now, how to work in a super snap line. Not much room left.
A D-264 . Could eliminate the two spurs or get another switch.
I'll ponder this some more - perhaps some old Lionel track plans will provide some ideas.