CRT Ideas

[cluelessgame]

I've had a couple of ideas (questions) regarding CRTs floating around in my head for a while now and would like to bounce them off you guys here to see if they'd work and/or are practical:

Idea #1:
Would it be possible to manufacture new replacement picture tubes via 3D printing? As RCA has shown, the bell of a picture tube doesn't have to necessarily be entirely glass. Would it be possible to print the body in the dimensions of the desired tube with readily available plastics, coat the inside with a conductive layer, and then attach a glass face and neck? I'm sure that by now (or at least, in the near future) there would be materials available that are strong enough to hold a hard vacuum as well as solid glass. If its possible then theoretically we could make replacement picture tubes of any kind (so long as we can mimic the original specs) at relatively low cost and make nearly any set in existence feasible to restore!

Idea #2:
When rebuilding black and white CRTs, would it be possible to replace the original gun with a color (3-gun) assembly and then hook it up (possibly with a selector switch) to where one gun is used at a time? That way, when the gun you're currently on goes weak/fails, you can just switch to the next one, effectively tripling the life of the tube. Not quite sure if it would work on tubes that aren't aluminized as the gun needs to be at an angle with a trap magnet to bend the beam back, but I would think this would work for the newer stuff.

Your thoughts?