Haven't done a hole saw through the hull, only a 1/4" hole for my solar line. But I will recommend that you check several times exactly what is behind where you are drilling. No, I don't have any humorous stories on this--because I checked a bunch! Then did a pilot hole and checked that.
2000 Beneteau 331
Northern Chesapeake Bay
Ambition is a poor excuse for not having enough sense to be lazy ~ Steven Wright