Ditto Dave;
With proper Radio gear installation, and weight management. You can balance virtually any aircraft to manufactured suggested CG.
SE with a YS 63, Modifications only cross braces on the Stab. Battery against the Back bulk head. Servo's approx. 1" from the Bulk head. Tank on the CG.
1 little Mod during construction was to insert a 1/8" Ply with 1/4 X 20 Blind nut in each wing panel. This allowed securing the wings with no worry about a rubber band breaking or stretching etc.

Every Plane I build I use the same basic technique. Building the Fuse first then mounting Engine and Servo's, Stab and balance the Fuse at approx CG prior to the Wing ever going on. Adjustment can be finalized with Gear/Wheels Prop,Spinner style, and final placement of Battery and Servo's can be slid after the wing is mounted. Then Final Balance is to do a Lateral Balance prior to the Wing being Covered.

Well anyhow you get the picture.

Have Fun
AMA 6518