HI Rhiannon -
Hope all's well. I've just added some info from MacGregor's 'Peat-Fire Flame' tome on the folklore of the cairn atop of the great Beinn na Cailleach mountain, Skye, then found parts of what I'd put were included in your entry of the chambered cairns below her eastern slopes. Thought I'd let y' know so you can edit 'em a bit if you like.
Cheers - Paul