ACK documentation

[Wysardry]

I'm confused about which documentation I should be reading if I want to (eventually) make changes to ACK (rather than using it as-is).

For example, are the documents on the white papers page of the Sourceforge site the same as the postscript files in the 5.5 historical release?

Are there any documents in the 5.6 release that aren't in the 6.0 releases?

Finally, is there any way I can help to bring the current docs up to date whilst I'm ploughing through the older files?

I've managed to find a program that can read and convert postscript files on Windows, but haven't had much luck in finding anything similar for man pages.