Which kit for 80-150cc Float Plane
 

We have a couple of float flys here every year, and I just never have a plane for these ocassions. I fly 35-40% aerobatic planes, and would like to build a float plane, possibly an amhibian, but it has to be large enough to use anything from a zdz80B2-RV to a 150cc gas engine. A 1/3 scale Cup is to small, since people usually put G62 and the like in these. A large Decathlon on floats would be nice, or a Beaver or Otter, even a Cessna on floats. If there was a suitable sized kit available of the Grumman Duck, I would really like that.
Please post what you know is available, what's your experience with these and how much are these kits?
DKjens