The prototype that Jon built for me was designed to "mate" perfectly with my existing Tone box (similar dimensions as his own cargo boxes) so right now the main box door will not open with the rear door closed because it's flush with the Tone box. The upper box will open with the rear door closed, but Jon used beefy shut-tight hinges so it won't come open on its own.
I would imagine that members who do not have a Tone or JAMAS cargo box would probably want a latching mechanism on the main door. I'm sure Jon could add that very easily with $1.50 in hardware and 5 seconds with a drill.
The first picture is just a mock-up; the last two are what I actually have installed. I gave Jon a few suggestions for the full production version, but it will look 95% like what you see here (unless you're willing to pay for additional customization of course).![]()