Very exotic looking bird! One flew at Havasu years ago, but I didn't check out the details, so I don't know if he modified it. From the photo it looks like the rear of the floats doesn't have enough floatation.

I think commercially available floats would be a good idea, but stay away from Sig, Goldberg and Great Planes. They are all too heavy. Check with SEAPLANE on this forum, or one of the other suppliers of sheeted foam floats.

It also seems that the nose of the airplane is very short, which would contribute to tail heaviness. The rule of thumb for glow powered sport planes is that the distance from the CG to the back of the spinner should be about 50% of the distance from the CG to the rudder hinge line. Maybe stretching the nose would help.

Keep us posted on your progress.

Jim

PS: Re wheels on the floats; that's not very practical. If you try to build them into the floats they will seriously mess up the water handling, and if you used a detachable dolly, you would be adding a lot of weight and drag and probably have trouble balancing the plane. Either way, you would have to use bicycle gear (two wheels on each float) because the rear of the floats won't let the tail come down far enough for a tail wheel to work. And don't even think about making the nosewheels steerable!

The good news is that the floats by themselves will work fine on soft snow or even wet grass.

J