YO!!! 25 is the engine power and weight you'd be happier with. Unless you like going around in the circle really really fast. In this case you don't really need the ringmaster, just a stick with a counterweight.

I'm not saying you shouldn't buy or do what you want, but come on, modern 34's to 46's listed for something designed to fly with a pukey 35?

Not a lot of nose room for tank either.