This video is a little old, but I think it's worth sharing again in case others aren't aware of this exciting project. The chassis is one component of a CRT that can be realistically remade in today's supply chain, and this project is aiming to provide a way to extend the capabilities of any CRT beyond what was originally possible.

From the video description:
I recently had the pleasure of talking with Thomas Daede, the creator of an open-source CRT chassis. This project aims to replace the current aging circuitry that drives CRT TV's and arcade machines, with more modern components that allow for more control and flexibility. While the project isn't ready for public testing, Thomas has made some pretty incredible progress so far and this has potential to completely breath new life into older CRT's. If you're a CRT-expert and have experience in high-voltage electronics design, please check out the Github link and see if you can contribute:

Github: https://github.com/tdaede/td-crt