After many hours of head scratching I finally grew some and cut the whole in the roof, and finished installing my shooting hatch in my mk2 Pajero.
Hasn't leaked yet so hopefully it has sealed ok.
http://i1279.photobucket.com/albums/y531/jonnyhilton/3da2e36da6815511799adc50773afb70_zpsc34e3787.jpg
http://i1279.photobucket.com/albums/y531/jonnyhilton/c0154648c05eea26c5df2ec017ad7021_zps63a930ef.jpg
http://i1279.photobucket.com/albums/y531/jonnyhilton/cb94c76a6c1f8bf6ae7992f92ac399cb_zps78b06c0e.jpg
All I need to do not is install a secondary wiring loom and a split charging system.
Anyone know anything about split charge circuits, there are two batteries already on the vehicle, but not sure if a third will be needed for the separate circuit? And anyone got any tips how to wire up, I have googled and it doesn't seem to technical.
Cheers
NB