I want to get into the big airplanes, trainer type at first. I have converted a ryobi 31cc . Any good or bad though on this.

Yup, yup, and yup...

I'm tickled to death with mine...
Now club members aren't throwing their weed whackers away...and going, Hmmmmmmmm....
It's been raining a lot and haven' taken any pictures of the monster yet...but will post some soon..

I am in that same stage right now. Ryobi is modified and running well. Will start building a bandito grande in a few weeks from rcm plans. Just have to finish repairing a P-38 first.
Edwin