I would love a quilt like an Arc Alpinist, but some comments by Jamie Shortt on a separate thread regarding his 18.65 ounce GoLite Ultra quilt raised a couple of thoughts/observations:
According to golite's website, a size "regular" Ultra 20 quilt has 270 grams of down fill. If my math is correct, this works out to a little over 9.5 ounces of down for a quilt with similar girth dimensions to an arc alpinist (this is an assumption...please correct me if I am mistaken).
Nunatak's website says that the arc alpinist has 11 oz ounces of down fill in their "medium" that fits someone up to 5'10" and 12 ounces in the size large, which fits someone up to 6'4". This leads me to believe that the Ultra 20 must not be as warm as an arc alpinist, but based on the numbers listed by Jamie (his GoLite Ultra quilt weighs 18.65 ounces with straps removed)a medium GoLite Ultra is lighter than even a medium arc alpinist in their lightest fabric, Quantum, by about 1.5 ounces. A custom sized alpinist to fit someone six feet tall (like me) would presumably be at least 2 ounces more than an Ultra 20.
My question is this: could someone add two or three ounces of down fill to a GoLite Ultra quilt to make it at least equal in warmth to an arc alpinist?
I've been working on a few myog sewing projects (bivies, tarps, synthetic insulation clothing), and have considered making my own down quilt as well. However, I think that if possible, adding down fill to an Ultra 20 (if found at a good discount/sale, for example $150-$175) would save a couple hundred dollars compared to buying a custom nunatak quilt (I'm a student, and on a budget), or conversely save a lot of time compared to making my own down quilt from scratch while only being marginally more expensive.
Those of you who own an ultra 20 or are familiar with the construction: are baffles continuous from end to end? Would I have to rip out seams on each side of the quilt to add down, or could I simply open up one end of each baffle to add down? In your estimation, do the seams on the sides of the quilt look complicated or difficult to remove/re-sew?