Jenn,
I got bored working on making the shed door bigger to get the trailer in, so I started playing around with a shelf idea. This is a prototype made out of some scrap plywood. Won't know if I'll go with it until I see how it plays out in the trailer, but I thought it would be an alternative to drilling holes in or attaching anything to the face of the cabinets.
I only need a 10 x 14 shelf, but I think you won't have any problem if you need to go bigger to accommodate your computer. The 3/8" shelf is butted against a 2x10 board that would represent the lower footwell cabinet. I would probably use 1/2" thick board when I make the actual shelf .
Currently these are the only two items I think I will need to place on the shelf and there is plenty of support for both.
The rods are 3/8" fiberglass about 18" long, I also tried 3/16" metal rods but they didn't provide the support I hoped for. I would have had to move the clamps right to the edge of the cabinet to keep it from drooping but I want to keep them as out of sight as I can. The metal clamps are left a little loose so you can slide the rods in and out for breakdown and setup. The screws that came with the brackets didn't pierce the top of the 3/8" shelf so they should be fine to use under the cabinet. I'm guessing CI uses at least 1/2" plywood there.
Not sure how much weight I put on here, but the shelf held up really well. The rods flexed a little but not enough to notice a separation at the cabinet face or make anything slide off. Sorry, didn't have any bricks lying around for this demo.
I know there are some master craftsmen out there that could refine my prototype... I would appreciate any feedback or ideas you might have.
aj