do335a,...i would think it would be easy to build,.......yes I haven't ever built one, I don't fly large scale,. but i'll tell you what,..... when I say "i would think" I am simply being courteous,...I know for a fact that I could build one probably better than most you can buy. for now on, i'll simply say, ...."what, ...you can build an r/c plane but you can't build a simple balancer for it ? ",...maybe that will suit you better. my real world experience takes me far beyond building something as mundanely simple as an airplane balancer, buddy,.....any time you want to compare general knowledge and talent about building things,... anything you can think of,....anything..... i'll be right there .... bring it, let's hear all about what you've built in your lifetime. . I've forgotten about building more things than you have ever thought about building,.... i'm sure of that.