Re: Can the floor rot from the top down???
I cut up an old Thunderbird trihull a few years ago and found an empty bottle of Jack Daniels, five gloves, two rusty screwdrivers and one wrench all foamed into a closed compartment beneath the deck up front. I also cut up an old Glastron last spring and found what I think was a dead pigeon or Seagull beneath the bowrider area. There was no way that I could see for it to have climbed in there with the upper cap on.
I had an older Dodge van which I bought from a family friend in high school, it always had a knock or rattle on really rough roads that no one could ever find. It got hit in a parking lot one day and when I cut away the quarter panel around the fuel filler door I found a small bottle of peach schnapps stuck in between the panels, half painted the color of the van. It had never been hit or worked on before so it had to be there from the factory. Inside was scrap of paper with a date on it from the year the van was built. The bottle was the rattle, it would flop side to side on hard turns. Once I replaced that side panel, and removed the bottle, the noise was gone. I guess the guys on the assembly line get bored from time to time. Besides, I suppose who ever stuck that bottle in there had to dump it someplace where it wouldn't be seen.