Leester,
Unless you're thinking of building it as CL Scale, it might be just a heavily-built model intended for RC on 60-ish engines.
SIG did sell a smaller Zlin stunter, companion to the Chipmunk they still(?) offer, and about the same size. They both appeared in the early 70's. The stunt Zlin had a greater taper than the Chip, and a bit less area. The taper was not as radical as the actual Zlin aerobatic aircraft. The Chip was more popular, and flew quite well.
Again, if you are thinking large CL Scale, that 70" RC kit might serve nicely. For CLPA, tho??