Though not a quilt and if you can wait for the preparation, check the Feathered Friends Vireo Sleeping Bag (http://www.featheredfriends.com/ProductDetails.aspx?productId=78&CatId=1&ProductName=Vireo). It has continuous variable depth baffles, is part of the Feathered Friends Layering System and is designed to take a high loft insulation jacket as part of the layering system. The Vireo is a hood less bag without any zipper (and needs no draft tube as a result). It is available in choice of color, materials, down quality, and down overfill. The sleeping bag has a girth of 64/48/38. The sleeping bag is available in 62", 68", and 72" lengths. Also, if you order the Vireo Sleeping Bag at the same time as any of Feathered Friends Jackets there is a 15% discount on both the sleeping bag and the jacket. If you order the sleeping bag, also consider ordering the Volant Hood which can be added to either/both the Vireo Sleeping Bag and the jacket through the use of installed snaps. If you order the Volant Hood have the snaps installed on the hood, sleeping bag, (and if ordered the jacket at the time of purchase- Feathered Friends has to install the hood flange on the Hyperion or Helios jackets at the time of manufacture). The Volant Hood can then be used alone, or attached to either the Vireo Sleeping Bag and/or the jacket.
The Vireo Sleeping Bag by itself is rated to 45 degrees F, but used with the hood the sleeping bag's ability is rated to below 32 degrees F. With the proper layering of clothing the system should be able to be brought down to at least into the low 20's or teens. The basic Vireo Sleeping Bag has down loft of 3" to 5" and a price of $210 (without discount) in Pertex Quantum. With upgrades to 800+ down from the standard 750+ down and down overfill, you can substantially increase the down loft and lower the temperature range of the Vireo Sleeping Bag.
My 62" long Vireo (I am only 5' 6" tall) was made in eVENT outer fabric and nylon taffeta inner fabric with 800+ down, 2 oz of 800+ down overfill and hood snaps. The Vireo Sleeping Bag as described weighs 22.4 oz (my sleeping bag loft varies from about 4" to about 7" [in the foot box]). When I ordered my system Pertex Quantum was unavailable. In the 62" size, this sleeping bag can be made as light as 16 oz and uses 8 oz of down (17 oz and 8.8 oz of down fill in the 68" long). The Volant Hood that I had prepared in the same materials and 800+ down weighs about 3.4 oz (even though Feathered Friends indicates 4 oz in lighter materials). The Hyperion Jacket that I had made in the same materials, hood flange, snaps, and 800+ down in large weighs about 16.5 oz.
You can add something like a silk liner (like a cocoon [about 4.4 oz with stuff sack]) to the system which can add to the warmth of the system or be used by itself if you find that the sleeping bag is too warm.