Almost on topic -
During the 70's the poor chap who 'Blew' Canberra Canopies (Hood Coupe in the IPC
) unfortunately died,apparently there was nobody else trained up
.
After some considerable time canopies became available again,although the first few out of t'factory were limited to day flying only due to distortion/substandard optical checks.
I doubt they were easy to manufacture as they were a 'Double Bubble' with an air gap between inner and outer perspex.
IPC = Illustrated Parts Catalogue