RE: arobatic float planes
I have seen Evan's plane fly. With a little more nitro, he could have taken the X-prize. It's HOT.
More Conventionally, EZ kits a pattern float plane ARF. The name escapes me, but it is a relatively cotemporary looking pattern plane, but the vertical stab is upside-down, to hang into the water to act as a water rudder, And it has 2 floats that are shorter than he 75% rule, mounted into the wing with large fairings....like the landing gear strut fairings on a GeeBee. I have seen those fly, (I was even midaired by one-little damage) and they are fast and precise.