Thanks so much for the thorough post! It was a great place to start my composting toilet legal rabbit hole. I went ahead and read through all of the RS&G. It looks like to me (for the record, someone with no legal background) that the classic Jenkins composting method (in regular three-bin composter) would not be permitted since it's open-air and isn't sealed against disease vectors, but the Omick barrel-in-the-ground system would. I didn't find any leads for what rules, if any, regulate an 'excrement storage unit'... If your system gets permitted, please let me know!