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You can get all you want from the stock chassis/CRT. Replace the caps, get strong tubes in it, add a cooling fan to the fly and chassis, and it should live as long as the CRT. Most Zeniths are easy to add a composite video input to...Just add a switch or (better yet) relay after the video detector diode to switch between the diode and your input. Having a spare set on hand is advisable when using tube sets as daily drivers....I generally run 2 at once so if one dies I can turn it off and finish the program on the other set.
I've used the crap out of my 1971 Zenith CCI 11 tube hybrid...It has been a daily driver for about 6-8 years and it has been decent, except for a couple of annoying issues related to parts your set is probably too old to have. It has had at least 4 hours a week and some months has had 8 hours a day every day.
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