On getting the cable through the fuselage, get a piece of 1/32 music wire and CA, or even solder the end of the cable to it. You can feed the stiff wire through the fuselage and pull the curly, pull-pull cable through.

I haven't started on mine yet because I'm finishing up a Burrito 3D plane for a kit review for R/C Report. The 3D Mayhem will also be a kit review.

If you side mount, where does the muffler end up? I guess you could use a Pitts. Looks like the plane is too wide for a good side mount clearance. I plan to use an OS .91FX with a Performance Specialties Ultra Thrust muffler (I need to stick to recommended engine sizes for the review). The plane looks awful big for a .91, though. Have to think light on this one and not add anything extra.

Personally, I think the Webra 1.20 will be ideal. It's light and powerful. With a lot of other engines, you'll be adding tail weight. I know someone mentioned the prototype used an OS .91 4-stroke, but the instructions show a Saito .91. If it balances with a Saito, we're in trouble. I have a couple and they only weigh 20.5 ounces with mufler. I put 'em in tail heavy .46 size planes.

Do you know how much fuel a Saito 1.80 burns!!