This is as close as I get to doing a gauge swatch....
One ball of yarn = about 12" of sleeve. Gauge is correct so I am going to keep on trucking.
If anyone else decides that they ever want to knit this particular sweater - I am posting both corrections and modifications on my Ravelry project page. Trinity stitch? Not in this lifetime. Flat and sew all those weird corners together? I don't think so either.
The Peplum obviously has to be knit flat but I will knit the lower portions of the sleeves in the round followed by knitting them directly onto the peplum as I get there. The way I have it figured there should be only ends to weave in but no sewing.
I don't think catching up with Barbara falls into the realm of possibility, so I am going to have to figure out a neat gift for her!