Hi Lanarman
Yes, I'm still on the boards! (Sounds like I'm an old-time variety hall player!)
Unfortunately I haven't been able to progress my Belturbet enquiries any further - I have not been able to find any records that might help, although I understand that the Johnston Library in Cavan might have relevant information. I just haven't had the opportunity to get over there (I live in France).
Sorry to learn about Col. Doug. If I remember rightly, his sister was looking after family history material at the Johnston Library (though I could be wrong about that!), though I don't see any specific mention on the library site. Could be worth checking with the library though.
I'm afraid I can't help you regarding Shane McGovern either. The site he had created (belturbet.org) now appears to be defunct and a quick Google didn't reveal anything useful. The last contact (e-mail) I had with both Shane and Doug was back in 2012.
I wish you success with your research nonetheless!