I'm also working on a first SUL list, prob. for next season. So take what I say with the necessary grain of salt.
If your goal is a just a very light load, and you like a few creature comforts, maybe 6# is good enough. I've been carrying a little less than 8# on recent hikes, and it's a joy. If you're aiming for the magic <5# number, my guess is you'll need to be more ruthless. What I like about having a particular weight in mind, is that I really scrutinize each item, wondering if I really need it.
To me, for example, your kitchen setup seems too heavy with too many pieces. I'm not sure fuel savings for just 3 nights justify the weigh of the wood burner. No need for more than one pot, or for chopsticks *and* spoon. I'm sure you can adapt your mate' drinking to a simpler kit--use a SP 600 mug for cook pot and in place of gourd, for example. Make your own bombilla, not out of titanium, but out of aluminum (lighter). I'm not a mate' guy, but I bet if you take a 6" length of thin wall aluminum tube, pinch one end closed, and cut a few slots near the closed end with a Dremel or file, you'll have something that works well. I happen to have a piece of 3/16" dia. x 0.014" wall tube lying around (easy to find at a hobby store). The weight of a 6" piece on my scale is about 2 grams.
BTW, Muji = great store. Wish we had them in the states.