The reason I made my own Roof panel was because I had decided to put all the Stall Warner and the head-set jack plugs in the roof. This would save putting the Stall Warner under the passenger seat where altering the settings of it be a fiddly job and be a pain under the seat. The adjustment will be dun thought a small hole in the corner of the head set recess. This way there is nothing to move or get in the way.
The Headset jack are also mounted here as I still think it is the best place for them. Out of the way and you can put the head set wires behind you in flight.