It's cracked around the mounting brackets for the deck. Drain plug is out...due to needing to drain a lot of water. I figure I'd have to have it vented. It looks as if this was a repair that failed, maybe torch welded even. Here's a pic of one of the cracks.
I welded it up on Friday. Not the most pleasant...started prep around 7am, and the welder was cooling down by 11. It had crept up to 100 in the shade! I ended up using 5356, luckily it's what I had on hand. Also lucky I took a bunch. Found a few more cracks. It looks like it hadn't so much been flexing, as it had a couple runnins with the dock. I don't do much aluminum, and usually it's "in position". This was mostly in between the toon and the center pod...a test of dexterity to balance, run the pedal, feed rod and have my fat head able to see. I did my part, inlaw got lazy and didn't drain the fuel yet. Don't know if it will need motor work, but at least she'll float.
