It's coming along piece by piece. I'm currently improving some of the old code in preparation for writing the remaining network node code. Recently I completed the implementation of the full validator. If all goes well then I should have everything implemented (Not tested) by a couple of months, but I am quite busy with other things and I can't be sure of anything.

Here is the new topic: https://bt.irlbtc.com/view/123488.msg1457871#msg1457871

People can watch the github repository to keep updated: https://github.com/MatthewLM/cbitcoin/