has anyone ever made anything like this? I want to be able to mount my spares and jerry cans on the side of it, and leave the cargo area open incase I need to run to lowes or something on the way home from wheeling. versatility I say! Any recommendations on material to use to keep cost down, being that it is only holding a spare tire or two, some jerry cans, maybe trail tools like an ax or shovel. don't know if I want it for structural yet. I'd like to be able to still take it off and put a topper on, or make a canvas topper for it.