If your old meters still work, then they should be fine. May not be as accurate or reliable as new digital but may be fine for you.
The toggle switches in the middle are all replaceable. You can reuse the on/off "labels under new switches.
It looks like circuit breakers on the bottom?? Of everything on there I would replace those with new style. You might have to fab new mounting holes but should be able to make them fit in with the rest of the panel.
I'd say the biggest issue is whether the function of the old panel meets your needs on the boat. Most older boats could benefit from more breakers to use them as on/off switches and circuit protection. Easier to fine tune what power you are using and isolate faults for trouble shooting.
Make sure whatever you do that the wiring
is good tinned wire and of a suitable gauge for the circuits. And use tinned high quality wire terminals.
Good luck. Must be an interesting project
. I would definitely upgrade the main battery
if you haven't. With the appropriate fuses
to new standards.