The CG should be close to the plan position as you can get it to start out with. Then move it around if you choose.
I'm not clear whether George designed the Peacemaker before, during, or after the Flitestreaks. I took Army training at Ft. Chaffee Arkansas, next to Ft. Smith, where the Fox factory is. At that time George was working for Duke. When I got my first weekend pass in January, 1958, I went to visit George. He was packed up to leave the next day, having quit Duke. He showed me the Peacemaker plans and said Aeromodeller gave him an Oliver Tiger for the article. A couple of years ago George's original Peacemaker templates passed through my hands. I sent them to Brodak in the hope of a later kit production. You can get a short kit here.
http://www.replikit.com/index.html It is on page 2 in the control line section. I think at one time the Peacemaker plan was Aeromodeller's best seller. It is still a popular airplane in England.