Reply to "Homosote"

I screwed mine down. One advantage not mentioned is if down the road you plan on structures. After you build them. It’s sometimes easier to scenic around them if your adding a lot of details at the workbench on a plywood base. When it comes time to place the scenic base on the layout. You can cut the area the base will reside in with a utility knife. This way the structure can reside at ground level. Screw it in place and add more screws around where you cut the hole. Fill the seem in and continue scenicing.