So here are my idea explained better.
First is a one piece hammock which goes completely around you. It has a bottom entry like hennessy hammock and would be made from a waterproof material of some sort. Those little triangles are the vents near the head hobefully where condensation would escape from and would leave a bit of airflow. The problem i forsee (other than condensation) would be a very cold back because of the water running along the bottom.
On to my second idea which is a modified hammock. Basically instead of getting a small light tarp made for camping. Just get a big waterproof piece of material and drape it over the top so it hangs down near the ground. Probably attach it to the hammock in a few spots to keep it from moving. It hopefully wouldnt need lines then since it would be held in place by the ridgeline and the hammock sides.
Hopefully ive explained that well enough. Would either of these be a good idea? Would sticking with a normal hennessy hammock be better?