LemonRX Wedge Case

I recently purchased 2 Lemon-RX receivers with diversity antennas, a satellite port and fail safe. The only problem with these receivers is that they come ‘bare’ with some sort of wrapping that is supposed to go over them. I have never seen the proper installation of this for of protection and I have never had much luck keeping it on the receiver. I have tried using heat shrink but I have never been happy with this either. I got out my calipers and decided to make a case for the receiver via