I built the CG Ultimate many years ago, with an OS 120 Surpass. You're right, it is a classic model that flies great. I sold mine only because I was tired of dicking around with that miserable, non-functioning DuBro fueling valve.

I agree that it is sized "just right"; however, I have an S-10 pickup with a fiberglass bed cover these days, and that severely limits the size of what I can carry back there, since I've only got 19" of vertical clearance.

I keep looking at the GP 40-sized kit. I've got a Contender to finish first, but that GP Ultimate is definitely on my short list for a next project.