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there is one more option from Pilot-RC:
Please, take a look at this post:
http://www.flyinggiants.com/forums/s...postcount=1020

It is 90" wingspan plane capable to handle 20cc to 50cc engine.
it is ~5kg heavy w/o floats and ~8+ kg with floats flying by 40cc gas engine.
the only thing ... I did front plane reinforcement with additional plywood panels and foam type glue.
it has very good airfoil for super slow flying capability.
Initially I was using it as a "stand" for my 40cc engine setup and brake in period, but later realize that plane is very capable to be loaded by over 3 kg floats and be a very good float plane flyer.
I am also using it on tires for high altitude aerial photography with 0.7 kg camera.

Andrei K.