Hammock bug net
for my simple gathered end hammock i used a piece of no-see-um and put velcro on the ends so it could close over the lines. I then slipped some weight in the middle of each side to hold it down. I just used the roll width - a hem and it just made the width, i mean just. The more sag you use (flatter sleep on the diagonal) the more width you'll need from the mesh as the hammock dips lower below the ridgeline.
An option i have been considering because to save weight is to just do enough bug netting so it can drape over my top half and tuck around my quilt. If it is cold enough for this to work (being able to be fully covered by the quilt) the bugs might not be an issue any way though. I would just take 2yds and sew 1 60" side together leaving a small enough gap for the lines. I would pull this over the head end and then when i needed it i could pull it over me and tuck around my quilt. This wouldn't be supported by the ridgeline but could have a tab over your face to pull it up to the ridgeline to keep it off you.
Right now i am testing a hammock (not made nor designed by me) that has full bug proofing so i hadn't gotten around to trying this out but it is my plan if i try to do UL or SUL hammock hiking. Right now i plan to hammock for canoeing only.