I was going to say that DIYaudio is THE place to go for advice on this kind of question. Lots of builders there.
I would NOT do a rebuild without understanding the original state of the speakers. I’m not sure about this brand, but for instance, Infinity had such wonky crossovers and impedance curves that attempting to replicate the original is a bad idea. Some Focals are the same.
Assuming the original crossover design is worth keeping, you’ll need a DATS or similar to make sure you compensate for any changes in ESR or DCR of replaced caps and coils.