Thanks for the suggestion about horizontal -vs- vertical wall hanging.

I'm doing some layouts right now.
I'm thinking of slots at 1/2" centers.
To the next 1/2", how much space would each lens need?
Some lenses project behind the lensboard, (rear caps included).
Each of my medium format lenses occupy 2-1/2" wide bays.
My 4x5 lenses occupy 3" bays each.
The Lens Garage in the photo (post #3) is 15" inside.

I'm back to the drawing board...