Old glass tube TV's never die, they just get thrown away. The is a very well loved Searay 48' sedan bridge, and the bad news is that it has an old electron beam gun TV inside of it. The good news is there isn't a VCR built into it. It works okay, but the coax splitter behind all of the gear has crapped out resulting in poor pictures on the other sets in the boat, and the sound quality is less than stereophonic.
The real trick in replacing older entertainment stuff is in not making the new electronics look out of place, and giving it, as much as possible a "factory made" appearance. The devil is all in the details.