If the stringer is hollow that really does not matter. All the strength comes from the box construction. The wood and later foam is only there for making the mold or box. If the glass on the stringer is in good shape (bonded to the hull and not separating. Just add more glass around the stringer box and you should be good to go.
If you go to page 2 of my build section about half way down you will see what I am talking about.
Have fun, that is half the battle.
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