Having received a comment from Paul about the rules, and a couple of email enquiries, I've updated the documentation on Google Docs. If you follow the link at top right for "My Own CCN-based ECW Rules", you'll get to the placeholder post which should now link to the new version. The changes are to the Rules Booklet and the QRS, and they bring it up to Ver.2.65, dated yesterday.
The changes reflect some previously-undocumented tweaks which I have been using, plus some typo-fixes, plus a few changes which are a result of my discussions with Peter Brekelmans about his 30YW variant.
Specific mods in the game include some amendments to Battling Back in Melee Combat, corrections to the Terrain Effects, and Light Artillery (by which I mean frame-guns and similar tactical, mobile pieces) now appears on the field only as attachments to units of Foot - light guns cannot be deployed as standalone units. Also, losses of artillery units no longer count for Victory Banners.
As ever, I think I've tested the links - if they don't work, or you are still getting the old versions, please let me know - many thanks.
I hope that some semi-formal documentation should also appear soon for the ECW siege game which I tested a few months ago - I'm a bit busy elsewhere at present, but it's in the pipeline!