I have ball bearing glide supports used in office furn. file cabinets. Normally loaded with blocks of particle board blocks 1" wide 12"Ht. and 28" deep the full width of the shelf. I'm making shelving for my garage. The pull out shelves would be for pwr. saw, pwr. drills etc. Others would be for boxes of fasteners nails, screws, bolts, nuts, washers, etc.. Currently the opening is set for 30" D. 36" W. If required I have .625W. x 1.5H boards to frame for additional support. Shelf spacing 9" to 15" for larger items. Am I out of my mind? Yes. Thank You, old_dog