Boy, I thought I had seen about everything!! What a nifty idea. All you need is a Lake (which I don't have). But if you have access to one, seems to be a winner!!! You could even catch your own fish fertilizer, come to think of it.........
Lowly, as the tomato plant grows, you are going to have to add a keel, like in a sailboat to keep it upright.
I keep re-reading this Thread and I literally have tears in my eyes.... what a Hoot!!!
Raybo