Shitty question-wocka wocka

Anyway, I own some land where folks go rock climbing and I am building an off grid cabin for them to stay in. It will be a sustainable endeavor that’s minimalistic. Still gonna need to do the thing. I’ve never had a need for a composting toilet but want something nicer than an outhouse.

Ideas? Recommendations on what to do or not doo? All the puns-

Brands?