Yeah, I've had my eye on that DIY Asym thread on HF. It might be a little harder since I have a 1.1 double.
I've also considered taking an old (12+ yrs) 20* synth bag and cutting it down to a 3/4 length UQ. It already packs small and light, so cutting it down would make it pretty light/small, and I imagine it would work well down to ~35* and up if there isn't much wind.
How long does an asym tarp need to be? 1' longer than the SRL? If so, would a 9.5' x 5' asym tarp with angled short sides work well? That should be cheap and the ridgeline length would be ~10.5' (one foot longer than my hammock).
Then that leaves me with needing a new bugnet...or maybe just a head covering that cinches around my torso? It would be lighter, and I have the noseeum mesh already.
Even still, with work ramping up, I might have to wait before these project begin.