At zero F I'd say both an UQ and a pad. Since you have a Hennessy the obvious choice is a JRB Nest. The Exped pad is an inflatable? Those together should take you to zero with no problem.
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I'd like to get a Potomac UQ from Kickass Quilts for my Hennessey. The regular size weighs about 28 ounces.
The JRB Nest is one size only, most hangers carry a foam pad to sit on like other hikers. This pad is typically placed under the legs on a cold night. I'm 5'8" and I shortened my Nest to 60" and I use the pad under my legs. I added the down from the removed leg area compartments to the torso area. I should add that my Nest is the older model with 1.5in baffles, current production is 1.9in with overstuff. Wearing long underwear, dry socks and an army polypro top and JRB HOOD and using a No Sniveler as a topquilt I can make it down to 20 F with that set up. I'm starting to get "comfortably cool" from below at that temp.
You'll have to make it yourself, Patrick no longer has time to make them. I MAY sell mine, I haven't made up my mind. A poster here named Bearpaw had his wife make him one and he seems pleased with his. He used it with a pad in an Eno hammock in some fairly cold temps recently.
If you can make your way through the We Don't sew... vid series, you should be able to make a KAQ as long as you understand how to use synth insulation. There is plenty of information on that already on the forums. Making a synth quilt is no where near as complex as a down quilt because you don't have the baffles to mess with. It is basically a _BIG_ pillow with attachment points. Easy to make and the directions are somewhere on line.
DIY KAQ Instructions can be found here.
Let me know, if you find you don't already have a buyer at that time.
Thanks for the link to KAQ instructions, Angry! Somehow I missed the critical information on Patrick's web site.
At $120 just for materials to make a KAQ, the discounted JRB Nest looks like a great deal.
- MacEntyre
I think 70 to 80 bucks would make a KAQ it you used 1.1 DWR. Momentum 90 would drive the price up. Patrick suggests modifying his design to suit your needs. I would make it 60in long (2/3 length). Climashield comes in 60in wide batts, this would create minimal waste and save money. The KAQ is a good design but it works better with the JRB suspension system in my experience.