Anachron:
Each wall standard is screwed into a wall stud (16" OC). I actually screwed 1" x 2" 's on top of the metal brackets, running from the backdrop to the front of the shelf. The 1" x 2"'s will provide a mounting surface for the masonite fascia. These were shimmed, where necessary, to maintain a level surface. I made a frame to span the window openings and support the foam. The shelves are 24" to 30" wide, but the brackets are not that long. The 1" x 2"'s give the foam full support, as they are cantilevered past the ends of the metal brackets.
2" foamboard was then attached to the wood with Liquid Nails for projects, then an additional 1" of foam was laminated on, using a water based contact cement.
The layout is not technically "modular," however, it is made up of 7 foot +/- modules or segments that can be removed and brought to the workbench for wiring, messy scenery, etc., simply by removing 2 screws from each bracket. This is a very sturdy construction method. There is no wood spanning between the brackets. The foam is very stable, on its own. The masonite backdrop also spans the windows. I made removable sections that are held in place with mirror clips. This allows full access for cleaning the windows. It takes all of 2 minutes to remove the screws, pull off the module, slip out the backdrop section and then tilt the windows in for cleaning. I'll post more photos to illustrate what I am describing.
