RE: 12 FOOT TELEMASTER FLOAT PLANE
Check with Balsa USA. They have floats kits for thier 1/3 scale Cub that would work fine. I built and I am flying the 12 Foot Telemaster with a G-38. If I was going to fly off of water I would choose a larger engine. Maybe up to a fifty size. The struts aluminum attachment point has a problem with cracking and breaking off. Replace these aluminum with steel.
Good luck
Bob