I have been thinking about how to use my rain skirt/kilt as a tarp door lately as well. Warning: I have only ever slept on the ground while backpacking until very recently.
I started off with a Tyvek rain kilt. I got some Tyvek for free from a neighbor, so I figured it was a good place to start. Weighs 2.7oz. I have used this Tyvek kilt quite extensively as a "door"/beak for my tarp on the ground. There is a loop in the middle of the long edge, and loops at the four corners. The loop on the long edge went over the tip of my trekking pole, the two loops on the corners of the opposite side were tied to the corners of the tarp. Voila, door. There is excess material with this set up, but it gets the job done and is super simple. See below for a picture of what I am talking about. This was my first pass at the set up, and my second tyvek kilt turned out much better. It used the shock cord draw string (used for securing around your waist in kilt mode) to take up the slack while in door mode. As you can see, it isn't a particularly tight seal, but it does increase the weather protection and privacy. I can also use the kilt as a partial groundsheet and leave the poly cro at home. I am making a silnylon version now (I have some scrap) and with all the materials cut out and ready to be assembled, I am getting an approximate weight of 1.9oz. Not bad. You could get a bit lighter with cuben for sure, but all cuben kilts I am aware of are made of 1.0oz/sqyd material. For instance, the zpacks kilt is listed at the same weight as my silnylon version. Maybe I made mine too small.
Tyvek Tarp - with old Kilt 1.jpg
One of the things that might make it difficult to use this type of set up with a hammock, is the suspension. You would have to figure out some way to keep the kilt/skirt/door from interfering or being rendered useless by the fluctuations in the suspensions lines. You could do something as simple as using a loop of shock cord to drop the "door" lower. This reduces the efficacy of the door for blocking wind etc. I have assumed that it is for this reason that most all the doors for hammock tarps that I have seen are split into two panel for the end: it gives the suspension someplace to go. I guess you could put a closable slit in the kilt, but that doesn't bode well for performance as rain gear.
I will have to do some tinkering here soon, once I complete the hammock tarp I am working on, as well as the new silnylon rain kilt.
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