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Yes I have done the hammer test - the hull is solid. My boat has a copper drain tube (looks like residential water pipe) that goes from bow locker all the way to stern sump area. This tube is intact but the the way the factory installed it baffles me. Where they "t" it up to the drain they should have used an elbo - but instead used a "t" then just forward of the drain they just crimped the end over with pliers or something. This clearly leaked forward and aft. My solution will be the same - I will drain it through the bottom like my 19 was and will cap off the copper tube as its just asking for trouble.