I'm quite indebted to this Forum for the CatSplat Differential Cut Underquilt Calculator that I used and all the support by way of others posting their experience. I set out to make a winter top quilt and loved the Differential cut approach so much that I used it in my Top Quilt design. Used ION 1.1oz ripstop from Dutchware and 16 oz of 900 Fill DWR down from Loose Goose down supply. The sewn footbox didn't quite come together like I had hoped but it works quite well. Took my son on a loop around the Grayson Highlands in April and slept like a baby in 40 degree temps while it rained for 11 hours straight! It's too warm to use it now but looking forward to cooler temperatures to pull it back out and see how low a temp it will support. Final weight was 28.75oz. So thank you everyone. Hope to start on a matching underquilt this weekend.
Aerohead (aka Jim)
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