RE: Maiden Flight of GP Cub with GP floats
>>>Jim can you post a few links?<<<
Sure. See my website, It's the "Frequently asked Questions"sticky. Or, in my signature.
Planefun floats and Seaplane supply are both good. Sea-Commander floats has a line of foam floats. Slocan floats gets generally good reviews.
The Cunningham article tells you what you need to know to select the right size and set them up, even to make your own!