I'm going to be doing this when i get some bills paid off. I'll be making it to fit a set of 6x9s. Has to be a 3" depth to clear them but its worth it! I will hang them off the main roll bar in the back using "U" bolts to clamp around the round roll bar. They will be more like PODS since i don't need them to connect............but mabey they wiill??
Anyways will use some cheap wood and just cover it in fabric to make it look decent.