The book is available at UCC bookstore, so I guess that, despite being published more than 30 years ago, it still has utility for studenting. Although I can't imagine many students will be happy to lay out €46.40 to secure their own copy. It is certainly an academic book and the vocabulary takes no prisoners [Skeuomorp, indeed] but it is also profusely illustrated with photographs [see R], maps and archaeological drawings. Prof Edwards makes the case that the decoration owes much of its inspiration to metal-workers, who were masters of filigree and wire-working. Think about all the torcs, brooches and chalices which fill Ireland's museums: so much delicate, fussy detail far and away from the object's strict utility.
You can just hear The Bish, instructing the poor stone mason. "see this chalice, my man, this wire-work edging is the latest thing in Armagh; I want you to include something at least as good in the cross which I have ordered". Maybe the mason rose to the challenge without grumbling; maybe he cursed the day he undertook the commission but he delivered! even the zoom in on the detail doesn't do justice to the fine-work which is a miracle in stone. Megalithic Ireland has better pictures.