ARIEL NUMERO UNO! PHOTOS PLEASE!
Great story that, the rescue! One fine skipper!
C'amos is right there is a huge amount on the deck/hull joint. Two figures of speech stand out, tho:
If that joint was 'working' you'ld be down there with the canoe! No way!
And imho that 1/2" half round trim piece plays a de'structrural' role in the joint. You have a hundred or more screws driven right into the seam, rail down you could be getting water in here. And a number of other places. Dead lights, ports, vents, thru hulls and thru decks, cockpit drains and seats, etc.
When it happens again, take a forensic look around down below, you know, like with a flash light look for the sheen of wet. When heeled and bouncing water can take unusual routes to the bilge and sole.
If, eg, you have water on the shelves, it has the whole cabin length to find the drain holes if you have them. Then the settees and the furniture will allow water in and run further along the hull. In 338's case the bottom tabbing on the settees just above the sole was cracked. A good thing because water couldn't stay in the enclosed space.
The Search will find our posts but the threads sometimes don't lead to a nice textbook cascade of fixes. Don't go silent on us!
And Ariel #1 is very, VERY intriquing, I, for one, would find any photos of the first Ariel extremely gratifying, Please.