How rough is too rough?

[Electronic M]

My decision point is not enough cabinet left to rebuild/remake, chassis rusted through such that important mountings are compromised or missing parts not worth looking for or buying. This is for very rare/desirable sets as the set in question moves towards dirt common/undesirable smaller things can be cause for execution, though I hate to destroy a set over something doable, and like a good challenge/practice candidate to potentially mess up while learning.

@Kamakiri: Why do block capacitors bug you? They are my favorite to rebuild. All you need to do is unsloder / unbolt making note of which wires go where. Look up the number to ascertain the contents. On the black tar type just chip the tar and old caps out with a screw driver (it is astonishingly easy, and can be done in <30 sec once practiced). Fish the new cap leads through the rivets to the terminals. Then bolt the sucker back in and reconnect the leads.