I really like the footbox idea on your neutron hammock. The Snipe footbox, which is from Knotty's idea, keeps the quilts inside, but effectively narrows the width of the hammock to do so. Whereas your footbox adds material, like Warbonnet's BB.
The big advantage with your neutron mod is that you can do it on both sides of the hammock, and due to the shock cord, can still enter and exit from either side without ripping the hammock! IMHO, this is real step forward in hammock design!