Presuming we wont be able to see much through the Solar Rear Hatch. Will the solar panels be attached to the glass or will the Rear Hatch be the insulated composite. It seems that in this case the rear hatch should be insulated and possibly have cooling fluid to keep the temperature down. But from a production point of view it would be less costly to make all the rear hatches the same with glass. Does anyone know which way it will go?