The next step was designing the layout of the dividers which I found best to do in any CAD software of your choice. Because the containers had accurate dimensions, I could play "virtual Tetris" in finding the most efficient way to pack as many storage containers as possible. Some items, like the iPad and portable printer did not have their own containers but their dimensions were still available and could be calculated into the design.
The dividing material ended up as a 1/2" and 1/4" thick high density foamboard. I got the materials for pennies on the dollar by going to a used materials store. It is the type of foamboard that gets used to create display boards at conventions or other signage purposes. The 1/2" foamboard created the outer walls and the 1/4" was used for the dividing walls. Attaching the walls together was done by cutting up some drywall corner bead strips (http://www.homedepot.com/p/ClarkDietrich-Building-1-1-4-in-x-1-1-4-in-x-8-ft-Corner-Bead-741339/204700931?N=5yc1vZc7qn) into ~4-6" lengths to create lightweight brackets. These brackets are conveniently pre-drilled and able to provide stability as they are riveted into the foamboard. I learned halfway through the process that I needed to provide washers on the the foamcore side of the rivet.
Once the frame was built, I used the cheapest, least-shaggy black carpeting to cover the frame for increased cushioning and overall sexiness. I did not need anything fancier than hot glue to attach the carpet to the frame. It is worth noting that the carpet does have a certain thickness and should be taken into account when designing the frame layout.
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