I've been pondering the effect of the kit's extra length, when compared to scale. I looked at photos of a similar bash made by someone else
That model seems to sit a bit "tail down" in the water.
The CG location will decide the balance point and I will be orienting the float so the step is just aft of the CG. In the scale 3-view, the float extends aft to a point about 61% of the CG to Rudder -hinge distance. If I keep a scale length float, it will only extend 53% of the distance on the model. The effect of elevator will be more pronounced on the float.
I'm really thinking about taking about 1.5 inches out of the fuselage.