Having lived with my Sawatch through this past winter I can say that I am still a BIG fan. As mentioned earlier, I too would ditch the adjustment strap and make the open up the foot/leg area down the back by at least 10 inches.
The "clips" appear to be the same as "mitten" clips that have come on a number of gloves and mittens that I have purchased over the years. The "tabs" and the quilt edge appear to be a custom item. I however, have yet to use the clips and straps. I am a tossing and turning side sleeper with a shoulder girth of 51" and 41" chest and have no problem with drafts. I use very small bungie cord straps that are attached to the bag only. I have a simple overhand knot at each end and then a couple several inches apart at one end and simply attach it to the flat sewn in tabs by stretching the bungie cord and slipping it into the slot. When tension is released, it stays put. This allows me to vary the girth, add flexibility for tossing and turning, and keeps everything together. Due to the warmth of the quilt, I find that unless it is in the 20's(f) or lower, I don't need them.
I have taken the Sawatch, a Kookabay downmat (R6 according to Bender), silk-weight long tops and bottoms, wool socks and cap, and my FF Hyperion down vest draped over me under the quilt, down to a minimum low of -5F. I was very comfortable but as always YMMV.
I have been to the Katabatic site many times and put the Crestone hood in my basket, but have yet to pull the trigger. I just haven't seemed to need it yet for sleeping. I would more than likely use it around camp in the evenings and mornings but just purchased a down hoody so I may never need it.
If I were doing it again and looking for one bag for all my use, I might be tempted to go with the yet to be released Alsek and the Crestone hood and augment my winter system with more of the clothing I already have with me.
I certainly understand those wanting more width, but I have found that the 3D contoured shape of the Katabatic to function as though it was wider than a simple flat quilt of the same width wrapped around you.
I have been playing with a MYOG quilt and have been slowing trimming the dimensions to see just how small I can go and still have functional utility that doesn't require significantly changing my sleeping style. At present I have girths of 40" top, 50" shoulder, 42" hip, and 37" foot. As a side note I do have the bungie cord straps deployed at a higher temp than the Sawatch to keep drafts out. It has 9 oz of down and 2" baffles. I have not been removing down as I take things in and currently have a pleasantly plump single layer loft of 2.5" and weight of 17oz.