Hi Lass.
A friend has just loaned me a booklet, "Dunnottar Woods and House 1782-2008" in which you may be interested. It is by George D Swapp, OBE, DL, MA and was published in November last year by the Stonehaven Heritage Society, 50 Allardice Street, Stonehaven, AB39 2RA. It has 48 pages but there is no mention of cost.