Managed to source an old Arcade Cabinet coin door from a local Amusement Machines supplier in Ilford. To them, the dysfunctional door is a hunk of junk, meaning I could have it for free. However for me, it could be a cosmetic gem  - exactly what I need to complement my project and further the impression of authenticity.

My Brother has gone to pick the door up - I'll update later on with pictures.