I didn't know what a VMAR Hotrod was either, but I just searched out a picture. Looks like an interesting plane. I'm new with floats but I'm getting the feeling that just about anything can be a candidate for them (well, maybe not jets ).

I think Twostroker gave you some good advice. Looking at the airfoil on that plane tells me that you want to make sure you have a good positive incidence between that symmetrical chordline and the top of the floats. Maybe as much as 3 degrees.

Like I said, I'm new with floats. If you want to really attract the attention of the boys and girls in the know, I'd post this in the seaplane forum.