Originally Posted by MartyE:
I've always done the build a table and throw a sheet of plywood down type of layout ...
Marty, that's what I've always done too, including my current layout I'm building. For elevated main lines I just build up trestles to raise them on the solid plywood.
I had wanted to try an open grid design but figured I'd make changes as the building went along and have to continually tear out the track bed to reposition when I'd want to change the track plan, which is easier on flat plywood.
But in retrospect, I used 24 sheets of plywood for my layout. Even if I cut out roadbed for an open grid design and made as many changes that I have, I'd probably would have still used less plywood.
I believe I have another big layout I'll build in the years ahead, so I'll probably do an open grid then!