where did you get those folding/locking shelf brackets?
If you want to find anything, and I mean anything, check out Lee Valley Tools. They have stores and do mail order. I'd hate to guess how many types of hinges they have for any application. I got tired of climbing over the table in the tent trailer to get to the bed, so I cut the table by a third and used a very strong hinge from Lee Valley that attached under the table and allowed the cut part to swing down, out of the way. Didn't have to clear the table to fold it. They have piano hinges, hinges like the one used and many others.
If you're doing anything that involves hardware, woodworking or gardening, you should check them out on-line.
I just bought a package of 50, 11 7/8" zap straps that can be released and re-used for about $5. I use these to corral my hoses and extension cables.
Even if you don't need to buy anything, browsing their catalogues will give you all kinds of ideas.