Thank you for all the informative and interesting replies and apologies for my tardy response. I think that the Hammock Engineers bug bivy looks great. I think though, if I could control the weight, the insect bar that Chazmo linked to is on the track that I am thinking of.
It seems to me that if there where some loops or ties sewn into the insect bar in the correct locations, sixteen to twenty four inches from the bottom, they could be hooked to the tie outs on the tarp which would give the netting some shape and hold it up and out, thus following the drape of the tarp.
I am really intrigued by the links to the prototype J r J hammock tent tarp. This fall in cold weather I often pulled the ends of my tarp together to cut the wind. My tarp just wasn't big enough to cut it though, the bottom was always to far off the ground to make pulling the ends together particularly effective. In driving rain however it was nice. It looks like the jacks Have added a separate panel of material to the outer edge of their tarp which will hang straight down, this is what I was thinking of doing with netting. I would think that this panel could be made from a lighter weight material then the tarp proper. Does anyone know if the panels are removable? I wonder how their setup would work when one has no trees and thus must set up with poles causing the tarp to be much closer to the ground. If anyone has more information on the Jacks hammock tarp tent I would love to know more.
What kind of netting material do folks suggest would be the best to use for a project like this? Are there pros and cons to different types of netting. I would want one fine enough to keep noseeums out for sure. Are the lightest weight netting materials substantially weaker then the heavier ones, do they tear if they get tangled in briers for instance? I wonder if putting a zipper at the end would be worth the weight penalty? Just thinking out loud here, any thought or comments appreciated.