This roof rack provides so much coverage that it may work much better when doubled as a camper shell by adding solid sides all around and a glass rear window in the back of the shell. Now, you have a large roof rack on the top and a camper shell under to further maximize the interior space of...
The F150 Supercrew comes in different bed sizes, hence various lengths. Most popular is the 5.5ft bed (232in length) but my Platinum comes with 6.5ft bed and Max tow package (modified steel rear bumper); it's 244in long.
If he redesign the sides to make them more "open" enough so some sunlight should still make it to the solar panel, provided that you don't have the top completely covered. An alternative would be rigid solar panels mounted on top of the cage. Just tossing some possibilities around.
Like the hidden gun vault suggestion. Android Auto is great on my F150; use it exclusively instead of Ford's optional navigation. I have a Tesla Model 3 DM and I love the Tesla's navigation just as much so I wouldn't miss the lack of Android auto on my CT!