https://www.youtube.com/watch?v=vszVJSpv5jM "Monster Stomp" - Minako Yoshida
You would think that something like this would exist, even at a more modest size. And yet, it does not.
This size is more practical for convention photoshoots with a pile of fursuiters, but it is probably stable on water. The tube is an estimated 4' (1.2m) thick, so climbing into it from the water would be virtually impossible.
The angle I used for this was primarily for the sake of a bit of service featuring Garrett when I was feeling cheeky.
Artwork, Aguro, Garrett © of me
"Oho!"