the TT 46 should power a .60 size trainer ok for scale like flight. A trainer has low wing loading anyway so it'll float nicely with a lighter engine up front. You may need to mount it far out front to balance properly.
You'll need a longer take off run and your landing will be around 1/4 throttle.

I doubt you will be able to do any inside loops since the tt.46 will be pretty asthmatic around 1/2way through the manuevre.
but if you just want to get into the air and float about just build it light enough and think of it as a powered glider.