Yes. The Midland six wheeler was indeed MGWR No. 13 (GSR / CIE 13M). The departmental livery for 1110 and others like it was red ends and a plain green side, with black or grey roof. It's faded to a salmony pink / orange shade there!
It, or one much the same, was at one time in a siding at Rathmore on the south Kerry road. I saw it there between 1975 and 1978 several times.
813 is a former GSWR third, owned by several RPSI members (as opposed to the society itself). It's been incarcerated in the shed there for forty years or so. I don't know if it was ever a camping coach. There was certainly one like it at Tramore, and I think another too.
935 was always grey when I knew it, which is why I doubt if it was a camping coach. There was, however, another old GSWR third at mullingar, parked the other side of 1110, which HAD been; it wore badly faded camping coach red and cream until it was scrapped / vandalised.