In another post I asked about making a cross over on my 8X12 portable table layout. It looks like this won't work. So, I'm not thinking about having two ovals at different heights that cross each other. Can I build such an animal on a series of 2X4 tables using that blue/pink insulation foam? Has anyone tried this on a table layout? How much work is involved? Would anyone with a track layout program like to make any suggestions as how to best lay this out to get the neatest, most fun configuration?