IMO, RAS is not the place to ask such a specific question. Review
the logbooks, and compare to 337's that the title search shows.
Contact the 337 originators and ask them the questions on the areas
they repaired. Most important, hire a competent repairman to do a
prepurchase inspection. Even if you paid for the repairman travel, it
would be a fraction of the price JJ has suggested for a possible
repair. If more people would do this, there would be more repairman
that would be less hungry and still affordable.

In short, treat this as a real aircraft purchase, because it is.
Check numerous on line buying guides, such as AOPA, and I think you
will find that this is a small portion of what is considered to be DD
on an aircraft purchase.

FWIW, I have seen a jagged crack I WAS SURE was structural damage,
only to find none, just the edge of an overlap splice. I have seen
fine hairline cracks at spoiler corners I was fairly sure was just the
gelcoat, only to find no glass under it, just wood putty. Also,
cracks in an area that taps good may have a deep dent/delam in a
sandwich laminate covered with filler, which may require structural
repair.

Aerodyne