ORIGINAL: Artisan
I am going to cut servo cavities in my wings and then use the old pattern trick of sharpening a piece of brass tubing so that I can cut a tunnel through the foam and into the servo cavity from the wing root. The tubing has to have a large enough outside diameter to permit passing the servo connector through the tunnel. This is easy as pie. Toss the aileron torque rods in the trash. That is where they belong.
I have a BME G90 gas conversion that I might try, although a Saito 1.25 would probably be the best choice for light weight and good power.
I'm with Artisan on this one, get rid of the torque rods and split the aileron servos up. For sure if you're going to over power it. I use the "heated rod" method to bore the servo tunnel through the foam wing then install/epoxy hardwood mounting blocks under the sheeting (and to the foam) for the servo mounting. I also did the "lightening" holes in the wings.
I ran the ST2500 (2 stroke 1.43? HP) in mine, swinging a 18x6-10. Of all the planes I've flown over the years, THAT one was probably my all time favorite. AWESOME flyers, and you can throw a lot of different motors at them.
I have a new ST 2000 (1.41 ci) that needs a new home......hmmmmmmmmmmm
Have a blast with it!
Gary