I'll second cabanestrut2002's image, that looks about right.
If you want some other references on the CG for that kind of design, look at some of the planes on
www.spadtothebone.com Even if you don't like spads, there are several variants on the PBF/DOT/StopSign type design, and you should be able to easily check those plans to get a general concept of where there CGs are.