Back when I was molding the hardtop parts I made an extra pair of side panels for experimenting with different windows or cargo hatches. In these photos I'm testing the fit of a panel with a cargo door.
The cargo door can be installed with the hinge at the bottom to serve as a cargo hatch/tray table:
Or the hinge at the top "gull wing" style:
I'm trying to decide if the best way to use them is one of the ways pictured above, or maybe with a storage compartment inside. Here's a few photo-edit concepts...
This one's a tool board that goes between the roll bar and the hatch, so there's limited space between the board and the hatch.
A deeper compartment would have to have to be shaped to clear the roll bar, I could make a fiberglass compartment something like this: