I theorize that there are more UQ tutorials because they are more complex to make than a TQ, especially a down UQ. A CS topquilt, at its simplest, is making a fabric/insulation sandwich in the shape you want, sewing 95% of the perimeter, and turning it inside out. Of course, embellishments such as zippers, buckles, and drawcord channels take a little planning.
On the one 5.0 CS TQ that I've made I oversized the shell, boxed the corners on it, and then sewed as usual. But I'm convinced that it's completely unnecessary, I just like the way it looks. I made a 20F down TQ and didn't differentially cut anything - it works great.
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