Originally Posted by hammock_monk
The outer layer includes an additional 4 inches to sides and length to account for the 2 inch baffles, as well as 8 inches for the arc of the baffle chamber. The baffle chamber is made up of (near center of quilt) 5 1/2" inner layer, 2" baffle walls, and 6" outer layer (forming the arc).
I'd be happy to get additional feedback on the design
I think you're going to be okay, but you might think about the difference in length of the inner and outer layers and allow a bit extra that you can cut off during assembly if it's not needed. The additional length of the outer layer that I suggested was not to account for the baffle height at the ends. It was to account for the lengthwise
arc of the underquilt when it's attached to the double curve of the hammock. As I said, my experience is more with insulated hammocks than underquilts, so that differential may be less critical in your project. You can
loosen the suspension of an underquilt if the outer layer is pulled tight lengthwise, but that sometimes makes the sides floppy (which can be addressed with side bungees and/or quilt hooks). I have two underquilts from JrB that are just flat parallel tubes, and both can be snugged around a curved hammock with care.