WES as far as reinforcing the wing go out 3 or 4 ribs and remove a small amount of covering on the bottom( rectangle to expose it make a rib of 1/16 ply and just glue in against it you can then glue a small block to it just use a piece of covering to cover the hole you now have a mount to accept a screw make up a couple of struts one end to to fus the other to the block in the wing this works quite well martin
also a OS46LA will give you more than enough to power the plane and not too many $$ very easy engine to use