I had some corrosion in my sail locker. When I replaced the bad steel I
welded it flush.

Don't you feel that doubling plates in the long run causes serious
electrolysis issues and should be avoided?

How thick is her hull? 1/2"

I ran a rivited tug in the early 90's. 1" thick hull that had 3 feet of
rust mud in the bilge with a few cement piles. What a nightmare that
tug was.

Joe