There's one thing missing here
Photos!
Can't wait to see what you come up with, Fab.
Raya
PS: Yes, on the "disposal" of human waste, there are many different acceptable ways. Some depend on the locale. For example, when I was boating on the Salmon river, we were to #1 in the river (arid climate - this is better ecologically), and #2 was into a pickle bucket with a slake of lime - the buckets were carried out and disposed of later. In other places, it's perfectly acceptable to dig an appropriate hole and bury. Etc.
Actually, if the siting is correctly done, I think a good-old-fashioned outhouse can be very low impact (and pleasant) - not that you'd bring one along camping, but the individual dig-and-bury is the portable version of that. A Porta-pottie and chemicals are perfectly legal and acceptable, but I'm not sure they're totally low impact in an environmental sense. I don't mean like people shouldn't use them, but just that "primitive" methods aren't always worse or bad.