Grumman J2F-5 Duck.
1 for water rudder
2 for tailhook
3 for front canopy
4 for back canopy
This is my first build that isn't just bricks put together the intended way, and I learned a lot. The aircraft is a bit cheaty (removed some drag to make it work in water and weight to try to bring it into it's real weight)
To take off from water, try to fly level and keep your wings level. As you reach above 50 mph, steadily start to pull up, forcing the aircraft onto the step. Once you hit 75 mph you should lift out of the water.
Be careful not to pitch forward too hard, as you can end up tumbling due the the hidden wings in the step stalling. Also the pitch trim changes A LOT with speed due to the hidden wings.