Just gotta let you know how much I applaud you for taking the first step in the DIY composter here. Initially it seems like you are stepping out onto a highwire but realistically how could it be any worse than a wet-head gone wrong? As a matter of fact once you get past the 'I fear poo factor' it seems striaght forward.

There seems to be plenty of information on the web regarding DIY 'composting toilets' for land use. And they all tend to be larger and swankier than what is really practicle for our purpose. Even the 'off the grid' crowd seem to enjoy taking plenty of space.

Hats off and a dropped trou to you!!

P.s. I noticed the now idle porta-potie in one of your earlier photos. I wonder if they would make a suitable platform to build the top half of a composter without too much work.