Hi,
Came upon this post and see you have the Armstrong & Beatty families coming from Donegal but on the marriage cert on your blog the marriage takes place in county Fermanagh in the Parish of Aghalurcher. The brides residence is given as Moat which I think is in or near Lisnaskea where the marriage took place the groom is from somewhere that looks like Cartown or Cortown which maybe Carntrone, a townland just to the north of Moat
You also ask about a James Beatty, a witness on the Cert.
A James Beattie age 23 was married in the same year 1847, the marriage was recorded at Enniskillen Reg district, Fermanagh his father was also a William Beattie
Regards