No articles I'm afraid but I may have information.I used one for twenty years, very successfully I think. If you can be specific in your queries I shall try to help.
I have a book by Percy W. Blanford called Sailing Boat Recognition (published in 1970!) which details the Mirror Offshore as follows:
Length: 18'10" (5.75m)
Beam: 6'8.75" (2.05m)
Sail Area: 122 sq ft (11.37m sq)
Spinnaker: 169 sq ft (155.66m sq)
Designer: E. G. Van de Stadt
Builders: Dell Quay Productions
No. Built: 400 (until 1970 presumably)
Van de Stadt Design may be able to tell you something - they advertise in PBO
