Thanks a lot NC Camper!
I read a few posts on the composting toilets and I like the system.
It's just that (despite being a complete amateur), I like to challenge myself with those infrastructure systems. Also, a really old friend of mine taught me plumbing 30 years ago and he would be so mad, if of all work pieces, I would chicken out on the plumbing of the holding tanks
I know, nothing of what I say really makes sense.
Sometimes, I see beautifully restored airstreams on ebay, except that they lack the bathroom or the galley or hadn't the electrical upgraded. They are still great and beautiful but for me - personally - they also have to be complete with regard to the systems. I think that's part of the appeal of them. Everything included in such a small place.