Hi twintwo - welcome to the forum!! I've not been here too long myself, but it's a great way to find things out.
I haven't got anything on the houses down Plymyard Ave (I remember them too), but have got some plans for Plymyard House which stood in the grounds of Plymyard Cemetry (off Bridle Road) until the 70's.
I could scan them if you want - Any good to you?
(My Mum's got some 60's photo's with this place in the background somewhere (I'm in the foreground!!) - I'll have to badger her for them next time I'm round there)
I've got this of Dibbinsdale - not very good quality I'm afraid, but it's something...