The scroll saw most definetly.
I use a 16" band saw with an 1/8" blade. I also use a 5" disc sander, this gets more use than anything. A drill press comes in mighty handy as well.

A couple of good sanding bars at 12" and 30" will come in very handy as well. You will want to get some medium and fine adhesive backed sandpaper for them as well. They really help to keep the wing panels nice and smooth while sanding. Try and resist the urge to use sand paper in your hand on the plane. The soft balsa will develop peaks and valleys very fast when sanding like this.
Later!!
Anthony