Ryan,
I don't know if you've tried it, but a Realtrax O31 loop does fit nicely inside a Fastrack O-36 loop if you don't have any really big trains. To get a little more clearance just put a 1 3/8" piece of Fastrack between the curved sections on each end.
The O36 Fastrack loop will need about 42" of width, adding the filler will need a few more inches... like a 44" or 45" width.
If you use 1/4" plywood, I would use ty-wraps to fasten the track to the table instead of screws. Works great. I did this on our club's 45" x 75" portable layout that has a Realtrax trolley line, inside a Realtrax loop, inside a wider Realtrax loop.
Have fun, keep us informed!
Ed
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