I use Kobalt magnetic rails for my standard sockets, and the 4 rail Kobalt socket trays for 1/4" and special sockets.
I got tired of knocking 20 of them over every time I grabbed one so I made these trays out of tin and migged the corners but you don't even have to mig them. I made them to fit snugly in the partitions of one of my top boxes where I keep most of them.







My solution was similar to 2oolhound's. I took the easy route and capped/riveted the ends.
You can do a decent job of bending using a vise (and angle irons), for those short walls if that is all you have.
Everybody laughs/pooh poohs this when I post it, but I have used the sides/backs out of washers and dryers when nothing else was readily available.
How did you bend those? I've been wanting to make something similar but don't have anything to make good clean 90 degree bends like that. Also, where did you get your stock material?