Joeviocoe wrote:
3) Would the Beryllium electrodes need a thin surface plating of Tungsten (similar to how the Copper electrodes were Silver plated)… to prevent the loss of proper filaments and reduce vaporization?
Or would that thin surface absorb too much X-Rays and burn up?

No. Beryllium is chosen because it’s transparent to x-rays. Plating the electrodes with Tungsten is as if you’re painting them black.