I don't think it is a full UQ vs. 3/4 UQ issue but the problem is exacerbated with a full UQ
The issue is that we are trying to make a rectangular flat quilt conform to a gathered end hammock with a foot box
To exaggerate, try to make a piece of paper wrapped around the bottom half of a banana. Now add a mutant growth on the side of the banana…
The shorter piece of paper [i.e. 2/3 or 2/4 UQ] means less gaps but also less coverage along the spine of the banana [i.e. your feet and legs are not covered].
I have a seen a number of excellent DIY UQs on this site that show you can fabricate an UQ that conforms to the bottom of a gathered end hammock.
I assume it is just a matter of time before someone fabricates a direct fit-up quilt for the WBBB.
It sure would be a highly specialized piece of gear.
Love my JRB BMB