I have just stumbled across a whole video about Lanrick Castle – only touching upon Sir John MacGregor Murray’s time there, but it’s very evocative, so I thought you might like to see it for yourself. You can imagine Sir John living there, and song-collector Alexander Campbell approaching it in 1815, perhaps a little in awe when he saw the grandeur inside:-
Dr Peter J. Gordon’s website is called “Hole Ousia”. You’ll find the Lanrick Castle video here:- https://holeousia.com/time-passes-listen/ruins/lanrick-castle-demolished/