Recently I built two vintage NOS Zenith amber CRT VDU's into special order Takachi enclosures. One thing was a successful CRT gasket/mask that was machined out of 10mm thick black acrylic. Using thicker acrylic this could also be a method to recreate masks for vintage CRT's too.
The article/story is here:
http://worldphaco.com/uploads/THE_AM...DU_PROJECT.pdf