As soon as the semester is over I'm looking at making some warm weather synth quilts. I'm in AZ and also would love something for fast summer jaunts, and the monsoon. Actually running the figures for my earlier post in this thread really convinced me (especially using silk). With climashield apex being so easy to work with and cheap compared to down, it's hard to NOT make some.
From what I've looked at I'll probably make both a 2.5oz and a 5.0oz weight quilt with 4.5mm silk (seems to work well for Bill Fornshell and he knows his stuff). Also at just ~.67oz/yd^2 it's really hard to pass up.
I don't have the MYOG experience to make very accurate projections, but I'm thinking the 2.5oz weight will come in under 10oz easily (using 2.16oz/yd^2 polarguard delta Fornshell made a 8.76oz quilt). The 5.0 oz should give something around 15-16oz total weight. Cost wise we're looking at both well under $100 each so my student self is rather happy on that front too.
Gotta say, I'm rather excited. I've been dragging my feet on making any gear for a long time now and finally I have a project that seems easy enough to cut my teeth on and actually helps me get rid of a crappy down bag I have that weighs nearly 2.5lbs and barely keeps me warm near freezing with all my insulating layers on!