Setting aside the ammunition liner stowage rack for a session or two, I've moved on to the 'holder, key cotton, strip'. This is a canvas sleeve riveted top and bottom to each tray wall. It holds a metal 'T' shaped metal key that opens the various stowage bins & panels on Australian Land Rovers.
For the model, I applied Tamiya tape to some lead foil, measured out the size (noting that it's doubled over to form the sleeve.

The foil was cut to size, doubled over and flattened out along the vertical edges. The Tamiya tape was removed from the back of the sleeve. A 0.5 mm hole was drilled in each corner.
As the LHS has been getting a lot of love this week, the RHS wall was prepped for the sleeve, then the sleeve was CA'd in place. The previously-drilled holes served as guides to drill through the skin of the tray wall. The outer surface of the sleeve was glued to its doubled position.
Once GTG, the riveting can begin. I used Turner Model Manufactory (T2M) 0.7 mm drilled rivets:

These were CA'd in place, replicating the riveted look of the original.

Just have to do the LHS & fabricate the two T keys and they're done. Thanks for looking.