Many of these have been made but I thought I would share the one I just made. It is held to the seat by a ratchet strap that cannot be seen in the pics but goes through another piece of wood and tightens up under the seat. It is incredibly solid. I also added a USB charger and Volt meter. The whole thing is easily removable with no fixings in the seat at all. There is also a little space for the odd item in the openable box
spy-sea-one
