I have completed the modifications to the back head rest area. It will make wiring so much easier, allow easier maintenance and allow me to move the my tools to the front of the plane.

The headrest now contains the Llightspeed electric ignition, MAP sensor, starter solenoid, 2 fuel probe modules, the voltage regulator, a ground block, 2 fuse panels

and the battery                

and the Engine Information system.

The two bolts above the battery serves to retain the battery and allows me to charge or jump the battery without removing the the panel.

When not needed the back headrest covers the equipment.