I’d head over to Gear Swap and pick up that GG Spinntwinn Couch is selling, and then head over to the already suggested Alpinlite Gear and get one of their Net Tents. I’d recommend Mountain Laurel Designs, who also make high-quality gear, but at this point, it’s be fall and bug season over by the time you got your gear.
As you can see from Jay’s picture, if you opted for afull-silnylon front door on the nettent, and you get a large (8’x10′-ish) tarp, you have what amounts to a double wall a-frame shelter for 1/3 the weight.
Or you could look at a hybrid like Six Moon Designs Meteor Bivy. Ron at SMD even publishes the MYOG pattern if you wanted to make your own.
The Spinntwin + either one of those options gets you shelter and bug protection for about under 20oz when you and in line and stakes.
If you haven’t settled on a tarp yet, I can also recommend Oware tarps. I had their Cattarp2 and liked it a lot before moving to a cuben tarp. Good prices and ships quickly too.
Also, as far as MYOG, there’s probably no easier project than buying $60 or so worth of sinylon and some grosgrain and making a 8’x10′ tarp out of it.