I have finished mine, too, and it has not flown, yet. I am also planning to use a PefectFlite timer. With D12's in the first stage and an E12-4 in the second stage I needed to put 8.6 ounces of ballast in the nose cone. Shown in the photo is a picture of the Boyce Nike Hercules on the left and the Roachwerks Nike Hercules that I converted to 2-stage on the right. The Roachwerks Nike Hercules is sports scale, so I am thinking that the Boyce model might be closer to true scale.