Very interesting work. I am not an expert by any means, but a quick search in the chapter on Jewish Law does not mention the Kibbutz. While admittedly the most interesting aspects of the Kibbutz are the anthropological ones rather than the ones concerning the legal system I suppose they could be an example of a “very different system”. Unfortunately I cannot recommend any source in particular. Similarly in the Iranian government the Legal and Political systems are heavily interweaved with the religious authority.