A few tips from my UQ thrills and agony:
1. The best way I know of to sew no-see-um baffles to fabric is to use masking tape. It provides a guide of where to sew and does not allow the fabric to pucker nor the no-see-um to stretch. Sew right down the edge of the tape (not through it), remove.
2. A spent piece of soap with a sharp edge makes a good marker on all but the lightest colored fabrics.
3. With a differentially cut outer shell, you'll want to put a pleat at the end of each channel to take up the additional fabric. The corners can be boxed which is essentially what you did, but that "triangle" of fabric could have gone to the inside of the shell leaving a clean seam on the outside. Just aesthetics, won't affect functionality in any way.
Ambitious project! Good work.
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