I am hiking the PCT next year and wanted to get away from my tarptent. Sleeping under the stars is a huge deal and massive condensation sucks. The design came from trial and error.
Although time consuming, making a cheap one-to-one fabric model helped greatly. The supplies cost about $225 for everything used in the pictures. Momentum, Nanoseeum, and SpinnTex EXP from thru-hiker.com were used.
These are the creations from the extra fabric. There are a bunch of stuff sacks, front pockets for the Jam2(3g each), a bear bag kit, a cup cover, and bug pants (42g).
This is one (131g) of the two bivys. They both have the same setup, but the other one is smaller(120g).
This is the tarp (148g without lines or stakes).
The bug net (58g with strap) setup up is hard to explain. It is a dome with a spandex bottom edge. Here is a stretchy strap that ties around the belly of the bivy. The net will cling to all sides of the sack with a bit of tricky cutting. I'm using straws to sub as the frame in the picture but that is just a temp rigging. There is enough room to read and type, but thats it. I would rank this as 92% bug proof which is perfect for the weight.
$270, needles and cheap fabric
45 hours of easy with-a-beer labor
Will be about 395 grams or 13.9 ounces for the bivy, bug net, tarp, lines(going to use aircore 1), and eight stakes...
I'm cool with that!