67" is a bit longer than most of the other .40-.46 Decathlons which tend to have around 60"-64" wingspan. The wing area is not much larger, though to make up for the 1-2 lbs additional weight compare to the others. I think even a .46 2stroke would be a little on the small side for this SD. Perhaps a strong .52 or maybe the new Just Engines .56 2stroke would be a better match. I wouldn't add any more weight by going up to a .60 2stroke. I have seen a Phoenix Models Sukhoi .46 fly with a TT Pro .61, and it flew too hot for my taste.

I think the new TT Super Decathlon has a two-piece wing and looks to be very well designed.