Good point. Bear in mind the quilt is still in the mail - so at this point I have not yet actually tried it out, and am just fishing for ideas. I am actually hoping it will fit fine as is, since I am a pretty small guy and that length will wrap around me pretty well. I am also hoping it will be fine with just a fleece balaclava for most uses. But I won't know till I try it.
Actually, I WAS initially considering getting a Summerlite (or rather, two - one for me and one for my wife - in fact I think you commented on that thread). What surprised me was that after talking it over with my wife, she really liked Roger Caffin's idea of trying using two quilts for better draft control (I was not expecting she would be so enthusiastic about the quilt idea). Anyway, I was thinking about all this and not sure what to do when a day later, I found the JRB on gear swap for a really good price - about half the price of a WM bag. I thought we could both try it out, and then if it doesn't work, I know that at least it will have good resale value here, and I can look at bags again. :)
I am not concerned about the quilt + UL inner keeping me warm (it will be way warmer than my current setup) - only about whether I will want a hood. My understanding is that the JRB + MB inner parka would be about 4 oz heavier than the Summerlite + MB inner jacket (2 oz in the quilt and 2 in the hood), but good to slightly lower temps than the Summerlite, given that 2.5 of those extra oz would be down. Given I am in Canada, I figure that warmth generally trumps weight here, as I would want the warmth primarily for shoulder season trips.