Updating A Gryphon's Tale for 1.4, 1.5

[phixxor]

Hello! I am interested in updating A Gryphon's Tale, one of the campaigns from the old days of Wesnoth. There are some files here, http://wesnoth.org/files/addons/1.0/unpacked/ , but I heard a lot more work had been done on this campaign since then. Does anybody have the more current files? This would be the first time I'd work on a campaign, so I'm not too sure how things work around here, but it was a fun campaign, and I'd like to see it on Wesnoth again.
Thanks.