Hi Tony,
It sure is! I got to meet Joe Dill a couple VSCs ago and had him sign an RSM kit and plans for my dad. Super nice guy.
Talked to him about the lineage while I was there. He never met Jim Van Loo so he isnt sure which Chipmunk came first, though with some time and research someone could figure it out.
Very nice model, and nice kit by RSM. Robin Sizemore built one a few years back and maybe a few others since. Fuse seems to be a bit more scale (more egg shaped towards the rear) and based on a Nobler wing like many other good designs.
**sigh** So many airplanes, so little time....