DIY golf cart dump box

I think this is the design I've settled on for increasing the load
capacity of the golf cart. You can order the shiny
new metal version for about 350 dollars, or maybe a sheet of
plywood with a few 2x6's could become a nice low budget home made dump
box for your golf cart. Soon this project will move from my imagination
to the Wetknee drawing board once the storage
building project gets wrapped up.
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I see some pictures but can't find instructions on how to build. Are there plans I can follow to build for my cart ?