Finished, just need to finish seam sealing inside and out. Now it can pitch as a hex or mid.
Outside, .75" webbing on a 2" x 2" square of Cordura:
Inside (stitching view, xbox inside of square):
The loops were sewn on 19.5" from the factory loops on two sides:
They were sewn on here (at green arrow to provide mid-panel stakeouts at ground level. The excess fabric is rolled up inside):
I can post pics of it setup later if anyone is interested. Setup is much faster in this configuration, with fewer angles to get right. Stake the front corners, stake the rear corners, stake the midpoints on the side panels. Less fussing with geometry compared to the hex.
I still might sew on some guy loops on the upper body, not sure if I want them yet.