A thing of beauty! This will be an another way to solve a lot of problems with the bridge hammocks when you want to close one end down, but then run into additional problems on that end due to spreader bars rubbing on the tarp. Or, just in general, a way to get by with smaller tarps without giving up wind/rain protection on trips when it looks likely you will need it. Maybe with little or no net increase in weight compared with a much larger tarp.
One thought: one or two? With one only, it could be pitched on the windward side as needed, and should not really be needed on the other end. But then, the wind does tend to shift during the night!