John,
This is very beautiful work and I am glad it is working out for you!:thumb:
However, please fill us in on how you can access, for example, the turnout toward which the locomotive is heading toward, for maintenance or scenery work.
Maybe you are exceptionally tall, or have some other special qualification(like being able to hover :mrgreen

but the 6' width is way beyond the normal recommended max of 30" reach, and even that is a long stretch for most people! I am a little surprised no one has asked about this before.
Maybe being able to lower the table down close to or on the floor helps you somewhat.
Anyway, like I said, I am happy it works for you! But this configuration should not be recommended as a general rule to anyone starting a table-top layout. In addition to making work in the center portion very challenging, when you start adding telephone poles, trees, buildings, etc. around the perimeter it will be very difficult not to damage them while reaching over to the interior of the layout!:curse:
Me, I am only five-six, and my 4'-8" wide table is all I can handle and then some! wall1
Best Of Luck!
Cid