Thanks for the responses everyone.
Comments about the net laying against the skin coupled with durability issues (I'm of a bit of a tosser and turner) have got me thinking that a DIY project might be called for (and fun!). Looking at Thru-Hiker's wonderful list of goodies, it looks like I could make a 55" by 108" shroud of nanoseeum with small grosgrain tieouts as well as some extra little loops on the ceiling of my Gatewood Cape for the exact same weight and slightly less money than the MDB bug bag. I think that setup will be more adaptable, easier to get in and out of, and keep me from worrying about tearing the netting I'm laying on if I twist the wrong way while trying to wriggle into some longjohns.
My rusty trigonometry is telling me that if I suspend the netting ~15inches above me with 45 degree angles to the ground, I'll have 6 inches left on either side and a ground coverage area of around 30 inches. Obviously, I could lengthen the line clipping up the netting to sacrifice some height for width if I needed more for tucking under me. I'm wondering where I should add in loops... Jason, do you clip it at the head and the foot or more towards the center? If there's something I'm missing here in terms of usage, let me know.
In any case, thanks for all the help, and I'll try to let everyone know if this kind of rig can stand up to Yellowstone's summer critters.