I have.Great Hobbies(previously East Coast Hobbies ) is the biggest R/C mailorder supplier in Canada.It has a good rep and decent prices.The Unionville Beaver kit is a builders kit.I built the 8 foot version.The wings and fuse have open bays which can be sheeted.Has a nice fibergalass cowl.Should fly good on a 120 4 stroke up to a small gasser(G-26).Floats are available with hard points shown on the plans.Instuctions are lacking in detail so you have to read between the lines somewhat.
Its a pretty good flier like the smaller and bigger 12 foot version...SteveD