Yes it is scratch built from leftover cabinet material in the shop. We had the engine so we designed the plane around that using a little research from the web. I'm not a member of any club and we dont have any one out here in the sticks that know anything about rc, so we are taking some educated guesses here. We did find a CG formula , but I think the wings ended up a little far back than I wanted. I think it is a little tail heavy. Thanks For the cg Link.