With that size, I would build the classic "Gumstump and Snowshoe " from MODEL RAILROADER MAGAZINE. It was 1x6 feet in HO scale so its 2x12 in O gauge, but I would expand it out in all 4 directions. Put in an O-42 oval connecting the lower level tracks, stretch the length to the maximum and add a few more sidings on both the upper and lower levels, giving you a chance to both have trains running continuously and also a little bit of switching between levels.
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