sounds like a lot more work for a marginal improvement. what material(s) are you going to use for baffel walls? I used "noseum" and thought it was a great substitue. .... on my own, i used sexless velcro for the long sides(tapered down from waist to fb. and a draw cord for the foot box & neck closeures. I added a neck collar/tube- and really pleased that i did! can't remember what the size of my tubes were - but I designed it for around 30 degrees.. but the lowest I've used it is around 35degrees ( and can't measure, untill I return to washington...in the spring) I did buy a down filled hat (blackrock) and usually wear it too- seems the perfect accessory..good luck on your project!