Well, after giving it some thought I redesigned the bench work drawing. There will be a "copy cat" of this bench work to create two levels when it is built. However with the lower and upper bench work it was kept in mind to keep them to where a train could travel to the upper level without much grade and visa versa. The idea I really like is that if the track design is laid out just right the top level could be taken down and bolted directly together (which would make it hard to crawl under) or a set of bridges of the same length could be fitted between the sections. The 5'2" section will be two pieces so it can be taken apart to move easily. All of the sections will be bolted to gather but the bench work will consist of the typical 1x4 frame bracing and 1/2" ply wood base. I already have the screw's, nut's, bolt's, and wing nut's of size in mind but I can't name the sizes right off the top of my head. I see a bit of a problem for the expanded setup but I don't know if it's a problem to even bother worrying about. Other than that I see no problems. It can be added to from any direction after the top level has been expanded down the main level to create a single main constant running loop or a more "variety" P2P run like the origianal plans are starting. All I know is that it's going to make the track designing a lot harder than when I first tried. I just hope this turns out to be more than a big waste of time. Back to the drawing board.......