Thank you for your replies everyone.
The hammock I am using is a Hennessy Hammock, I don't know the model but the ridgeline is 108ins, its brown in colour and has black support lines which are over 1/4 ins thick. Any ideas?
The reason I thought of using the KAQ design was it looked good and I thought the set up would be less crucial than with the JRB type design - thanks for pointing out the pit falls in my idea. Just the kind of feedback I had been looking for to keep me away from disaster.
I'm getting the idea that the sleeping bag I intend to use might be to narrow at the foot end to make a nice looking underquilt. I will measure the bag and post back the dimenssions I have to work with.