Hi Jessiboo,
I am also researching Alexander Fraser of Dalnamine farm, Kiltarlity; I am a descendant of his son James born 1787. I did find a description of Dalnamine in the Inverness-shire OS Name Book 1876-78, Vol 49, p 17, Kiltarlity: Small cottage, one story high with outhouses attached, thatched, in good repair. Lord Lovat, proprietor.
There is also a map of the farm dated 1852 available online - see the link below. According to google maps the farmhouse is within 1/2 mile of both Beaufort Castle and Belladrum. I was also able to find a recent photo of the farmhouse dated 2006 when it was offered for sale - I'll put that link down below too.
I have not had any luck identifying Alexander's father, and any help you could offer would be greatly appreciated. I found an Alexander born 12 Oct 1738 at Kiltarlity (the year works with the age Alexander gave in his deposition regarding the Fraser of Lovat claim which you referenced), however I found in the book "Some Fraser Pedigrees" by Duncan Warrand (1934, p.14) that that particular Alexander died 1784, so not the right guy since our Alexander lived to be at least 88. I'm doubting that Captain Tomm was his father, since Alexander had five sons and didn't name any of them Thomas - if he had followed the Scottish naming traditions then his oldest son Donald would have been named after his father - so I am stuck.
You mentioned in your post that some of Alexander's descendants immigrated to Nova Scotia as well as descendants of your Mary - could you share the names of the immigrating descendants? I'm curious to see if there is a DNA connection anywhere in there with me, just to confirm I'm on the right track.
Thanks, Laurie
link to Dalnamine map:
https://maps.nls.uk/estates/rec/6300link to Dalnamine photo:
https://www.geograph.org.uk/photo/274378