I designed the Gr8Tops box and mine is the preproduction prototype. The only difference betwen mine and the production box is that I made the production box slightly lower so it can fit under a tonneau cover, after I had the prototype built by the box company I decided it was slightly too tall.
An original design sketch:
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And before having the prototype made, I made up a scale model in cardstock:
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In the process I also designed a few other TJ/LJ storage boxes, but Gr8Tops decided not to put them in production...
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I'm sure that's way more information than you wanted, but I came across these images and thought it would be fun to share them

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