Can't answer your question, but I will say I was really pleased with what going from 4x to 5x allows you to do. That extra foot really makes things happen.You'll be pleased whatever you do.
I researched 4x8 plans to get ideas for the innerloop and used the extra foot for an outer loop.
I stumbled across some really nice 5x5 plywood at the lumber yard. No cuts and a reasonable size for handling.
http://www.lionellines.com/displays.html
Check out some of these.
Bob Mitchell Gettysburg, PA TCA # 98-47956 LCCA# RM22839
Our community is FREE to join. To participate you must either login or register for an account.
Get the Classic Toy Trains newsletter delivered to your inbox twice a month