My original plan was to make both sides hinged, but after thinking about how my cooler would be mounted behind the drivers seat I decided to leave that side rigid just for additional stability. I now have the ability to secure my cooler in place and strap 4 MFCs to the exterior basket for some additional fuel range.
Realistically I don't gain that much access with the hinged part, it can all be accessed from the rear of the 40 anyways, it's just a little more convenient now. As soon as I relocate the speaker box.