I too would like to utilize my cargo cover *protect items from the sun* - AND be able to use the molle panels when camping or offroading. My idea is to get a cheap cargo cover that doesn't need to fit my car, but just to practice on.. punch a few sturdy grommet holes in the 2 corners that you would grab and pull towards you, (might have to trim sides a little), add 2 carrabiners to the 2 grommet holes you just inserted (may have to buy a cheap grommet machine), connect each carabiner to a molle panel... the pressure on both sides MIGHT hold it taught enough (if you place the grommets far enough in) to hold the screen tight?

Just an idea.. i'll be trying it soon and will post pics if it works!