Just as Grey Bread said build it as the book says they come out great on the turtle deck area. A little filler and sanding and your done. I use Dap fast N final Spackeling , I get it at WALMART.

The 115 Saito may be smaller and lighter than a YS, but it is no way stronger or as strong, even the horizon webpage says its bench marked prop was a 15x8 @ 8800 RPM's Ok so I run a 16x8 APC on my old 120 SF's and NC at 93-9500 a full inch longer at 800 RPM's more on 15% fuel. My 120SC which is in my GB Extra will turn that prop at over 10 K if I let it.
The 110 YS will swing a 16x6 APC at about the same RPM's i'm getting and is a much lighter engine. I'm not saying a saito isnt a good engine I have some myself, but there nowhere as powerfull as a YS is.

I used 2 servos in the fuse for the elevators not in the tail which worked out good. My total weight is about 8 1/2 - 9 Lbs with the stock pull pull and a 120 YS under the hood twin aileron servos , glass cowling and pants. The plane fies very light at this weight and floats coming in for a landing. I think that large prop may have alot to do with that. The 120 SC will take it straight up out of sight at a little over half throttle.
When I get some time I will get some Alum gear from Fiberglass Spec that should help even more to lighten things up.
The one I am currantly building now is the second one for the year. I got talked out of the first one.