I've been mentioning the features on the blog casually. I haven't really gone into detail because, while Horner has mentioned this, he hasn't affirmed it with strict data. My own personal examination, of the dorsal and ventral surfaces of the parietosquamosal frill, is that they show superficial features, but not necessarily the histological ones, that correlate with keratin sheaths. The same structures on the horns.
As for my blog, not at the moment.