I made my first summer quilt using those instructions. I am not crazy about this design. It works ok for a summer quilt but I would maybe look for a different idea for a 7.5 Climashield build. This design doesn't have a full length primary suspension. 7.5 climashield is going to be heavy and sag.
You should keep the dimensions of the top and bottom the same.
Making it a little wider is ok but remember the wider the hammock the more tension required to get it up against the hammock bottom. Making it wider does not necessarily give it more coverage. It will just need to be hung higher. 46" to 48" is about right for an under quilt. Go look at the dims on the UGQ or Hammock Gear site.
I also had an issue with sewing the channels on the end to cinch the under quilt. Also this design uses only a secondary suspension.
I built a winter 10° under quilt with 7.5 in December. Take a look at Dutch's Climashield quilt here
https://dutchwaregear.com/2016/06/09...ld-underquilt/
I really like the fabric channels rather than using Grosgrain. I modded this design and added a secondary suspension by simply attaching a 3/4 1.5" loop of Grosgrain and a lineloc 3 at each corner.
Take a look at my build here.
https://www.hammockforums.net/forum/...=1#post1941251
The biggest issue with Climashield is it is VERY bulky. If you plan on a 1" seam allowance I would add at least another 2" to account for the Climashield walking and bunching on you. If you want more loft and have excellent sewing skills like JellyFish you can box the corners. Unfortunately I don't have the skills she does.
https://www.youtube.com/watch?v=5UQVLGdTxHs&t=2052s
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