That's true but not the point, the point is you need not go out and spend a pile of money on a high end CG system. Some people just love the new gimmicks and have pockets that are very deep, most of us are just sport pilots and can get away with just making a system like a Vanessa rig or a couple of cut down dowels stuck in a base. I have a small 3-D Extra ARF from AeroWorks that I used a couple of pencils stuck in a foam block, nothing poked through.
I still have my how to trim instructions from the pattern web site tacked to my wall, I think it is still on the AMA site. I still trim like the instructions say on any precision plane I build, I do it to most of my planes but some I don't take as much time to do. Some planes I have CGed and trimmed for different wind conditions too. I like them a bit more nose heavy when our wind kicks up.
Tex, you CG a bipe right side up using the top wing. What you use to get the CG is up to you.