No I'm afraid I've looked very little at the actual protocol, mostly been busy running a node. I have seen a few people write their own AP implementations, in

No I'm afraid I've looked very little at the actual protocol, mostly been busy running a node. I have seen a few people write their own AP implementations, in their personal blogs for example. It doesn't seem hard. My suggestion to learn AP would be to integrate your own blog into AP first. That way you learn by doing.