Brian:
can you hint at what you're planning to do with the layout? If it's going to be a game like the Time Waster, you can make it trickier to operate. If you want it more scenic, you could make different alterations.
The tail track at the left is only a foot long and might hold a 40' loco and a 40' car. Frustrate your operators by making it not quite long enough, or using 50' cars. Make sure the cold storage warehouse gets 85' long box cars so that that tail track is crowded.
Or improve the scenics by reducing the 3 parallel tracks. Turn the switch to the cold storage the other way and move the track back. Run the siding at the front to the corner rather than turning it.
I built a layout on a 12" plank once. Was nice until the plank warped because I put no bracing on it.