Okay, I think I have finalized the design (it's sure easier to change things on paper, before cutting). Attached are three images: 1. Inner Layer; 2. Outer Layer; 3. Both, side by side.
The outer layer includes an additional 4 inches to sides and length to account for the 2 inch baffles, as well as 8 inches for the arc of the baffle chamber. The baffle chamber is made up of (near center of quilt) 5 1/2" inner layer, 2" baffle walls, and 6" outer layer (forming the arc).
I'd be happy to get additional feedback on the design (I've been a bit surprised not to get more feedback), but I am now moving on to ...
Materials: I am thinking 1.1 nylon for both layers and noseeum baffles. 1/8" shock cord for suspension, with cord traveling through end channels on the quilt. I am thinking of Wilderness Logics for those materials, plus 850 down. But please let me know your opinion on both materials and vendors. I look forward to hearing from your experience before I pull the trigger--remember, I am buying material for not one, but two quilts.