>>The only other alternative I've seen any where near this weight class is the simblissity net at 4.6. But it's only 4' long and a little under 3' high. It also uses poles at either end and as such is not compatible with the cape.<<
Just to clarify, the Simblissity Inner Peace is designed for use with rectangular and cat-cut tarps, as opposed to the center-peak profile of Ron's tarp shelters. The IP probably wouldn't work too well with Ron's, just as Ron's probably wouldn't work too well beneath a standard-pitch tarp.
Like the Serenity, the Inner Peace uses a single pole and can be pitched on its own. Using a GG Polycryo groundsheet beneath the Inner Peace, or a UL bivy bag for lower leg coverage, also provides the flexibility to forgo the netting altogether on bug-free nights.