I have a Saito 91 FS in mine and had to add nose weight to balance with the servos for elevator and rudder in the fuselage at mid wing position. I added extra wood to the wing hold down area and tapped for 1/4 20 wing bolts. A quarter inch off center at the wing centerline won't make much difference as long as the amount of wing extending from each fuslage side to the tip is about the same. If one wing half is longer than the other it would cause your wing centerline to be off of the fuslage centerline. Watch the dihedral. You may have to add extra foam tape to one of the wing saddles to keep dihedral angle equal on left anf right wing. Your Saito 100 will power your plane quite well. Mine came in at ten pounds and the Saito 91 hauls it around just fine.