DIY compost toilet

[devolutionary]

I'm not talking about a bucket compost toilet using a Boots fermenting bin hidden behind some tongue and groove, a bag of sawdust and leaves for soak, and a stack of steel radial tyres for long-term storage (we already do that). I'm talking about something a bit more lux - a bit more Clivus Multrum, if you know what I mean. Like where do we find a good metre-cubed composting container with an inspection hatch and a toilety looking stool that's easy to clean from above. Added problemish: We're in France and can't get hold of recycled juice containers (to my knowledge).

Any help appreciated. (Winter's coming and we're a bit desperate.)