The GP is a much easier build then the CG kit. For the most part it is the wing in the CG kit that takes a lot more work. Other then that the parts count and the use of light ply in the CG kit is a bit more. It's been a while sense I built the GP kit so I have forgot quite a bit of the details. I just finished the CG kit last week. If I was going to build another one I would do another GP kit but that could just be because of the really poor die cutting I ran into with the CG kit. Flight wise there isn't a nickles worth of difference.