Composting Toilets

[GMac]

Had a search but as I lack Gords search skills I may have missed something, aim me if I have.

I want a composting toilet, not for my boat but a project my Daughter has dragged me in on. A completely and totally self contained little house made from renewable resources and which can be recycled.

Also been on a couple of yachts recently which have fitted them as a way of getting around having to fit holding tanks. Quite clever I think.

Who's got one, who knows about them and what should I be looking for and/or staying away from?

Dare I say it's been a bit of a '****' trying to find out good info on them. Yeah a bit limp but it is early and pre-lots of coffee