Having just received a DuoMid from Ron @ MLD, I am very interested and impressed with your prototype. I too have yet to learn how to sew so I feel your pain :)
At 42" wide, that is plenty of space for 1, and since it is floorless, digging down is an option. There are a few guys on here sewing tarps, so maybe one of them could give this one a try in silnylon maybe?
I like the V-config as it gives much more room inside. I also like the pole sleeves, but was just thinking...could you get away with just 2-3 loops along the side instead of an entire pole sleeve? It would save material (and weight), sewing, and seam sealing...Just thinking out loud, maybe you need it for stability.
Great work, keep us posted.