Also known as Da Plan!
OK, here's a rough run-down of what's going to be happening in PDM for AHD.
Substates aren't going to be making an appearance. Do not bother asking me to include them for anything. They are solely intended as a China nerf in AHD, and since we already have a very effective set of China nerfs (low core count, Taiping), we do not need them.
The existing PDM multi-stage civving process, despite being a lovely elegant little thing which I put together in about twenty minutes, is now an obsolete pile of junk compared to the stunning new thing in AHD, and so will be abandoned.
The economic AI in AHD is designed to understand being dirt-poor, so money supply will be massively tightened, factory profitablity will be cut down hugely, and I'll basically re-write the economy calculations from the ground up to take full advantage of AHD's AI. Extra goods shall remain. Extra inventions shall remain. The PDM-style industrial progression shall remain.
Other than that, I don't think much else needs to be changed - just adapted. Some uncivs will be needing to have their new reform levels set up, which I imagine Hibernian will love doing. Someone (not me, I'm writing an economy) will get the thankless task of copying over the 1861 setups, since those are stored in the individual province files. And I will merge in the changes from the various stuff in common etc.
Hence, I think we can easily do this in a week. Any volunteers for mindless drudgery in the history files?