James,
I followed the link that you provided to Sectionhiker and liked what I saw.
The pictures at Sectionhiker mimic the exact way in which I use and "don" my top quilt.
I have an older +20* traditional mummy bag that suffers a little bit from being a little "overweight". It might be a great candidate for this modification. My quilt lacks a hood which requires me to wear some sort of insulation on my head at night. If I modify my old bag I could lose some unnecessary bag weight and gain a hood for those cold nights. Hmmmmmm. ;-)
Party On,
Newton

