Managed to complete one game, started as Werner von Habsburg and ended up with a Habsburg HRE. Dynasty members included the Kings of England, Sicily, Poland, Jerusalem and one or two of the spanish kingdoms.
Got very tedious towards the end, all those peasant revolts... and any war against a not-minor power was very tedious too, because the levy raising interface for large realms is not ideal. I ended up simply raising _all_ my levies and disbanding those I didn't need. Of course I inevitably forgot some, and they got crushed... It was especially annoying when a far-away muslim declared war on me, it was a nightmare to transport all those troops to the Middle East to defend Jerusalem. So much clicking.
And even though the Habsburgs remained Holy Roman Emperors for more than a century, my score at the end was not _that_ high, I think ~70000.