Hi Guys thanks for your help and thoughts,
I quite the like the idea of a side mount container, throttle on the right hand side reserve on the lower left, the only disability with this set up is it limits you to only use your left hand to for deployment, A ambidextrous location would be best. just in case everything goes south and one hand is trapped least you still get a second chance, i think are do a hang test with the motor and try mounting it behind the head and on the side and try and get a feel for reaching around and grabbing the handle, but i have found that a hang test is quite different to flying, as when i strap my self in to the motor on a hang test i can easily reach the pull start handle which was located behind my left shoulder, but i soon discovered that once in flight i could not always grab it...