What changing a landplane into a floatplane required

Could an aircraft become a floatplane by simply adding floats, or did it need rebalancing?

It required performance and balance work, including drag and water-takeoff calculations plus structural bracing, even when existing gear mounts were reused.

Attaching floats near the landing gear points still required performance and balance work. Designers had to account for added drag and verify that the engine could still lift the aircraft from water. Wet-float weight, changed balance, and additional structural bracing also entered the calculation. Float geometry itself could help restore stability.