Having flown this on the water a few times I have grown tired of the thing getting on step and veering to the left or right on its own, so I ventured down the path of doing a mod so this thing so it has a water Rudder. I hope this helps you if you need a water rudder too.
You can find this model at:
https://www.hobbyzone.com/hobbyzone/H...
The Floats can be found at:
https://www.hobbyzone.com/specials/en...
Receiver AR630: https://www.horizonhobby.com/product/...
ESC Avian 30amp: https://www.horizonhobby.com/product/...
Links to the parts I used for the rudder
Rudder EFLA55001: https://www.horizonhobby.com/product/...
Rudder Mount DuBro 156: https://www.horizonhobby.com/product/...
Push rod set HBZ3218: https://www.horizonhobby.com/product/...