I don't have a tab but looking at the Steve Baughman version I can make a couple of suggestions. Morgan Megan is normally played in G as per a tab in the tab section on the site, but Baughman is playing in B.
As far as I can tell his tuning is Gb Db Gb B Db. I found I could busk the tune using this setup.
The triplets he plays are using his California roll, his own invention, which is demonstrated more clearly on another YouTube video I found. I haven't got a link but just search for Baughman California roll.