This the not the Sarpolus Cahllenger. Dick's design is a Nobler size profile for a 35 or 40. (I hear good things about it. Flying Models has plans.)

One of our guys, Keith Sandberg, designed this little Challenger as a kind of advanced trainer. It is 33.5" span, 26" long, about 300 sq inches. Ours weighs 18.5 oz with the LA 15 and stock muffler. Kind of jet style with the forward canopy look and raked wing tips. There aren't any kits or formal plans. I do wish Keith would work it up and submit it to FM. I think they would publish it. This little dude flies great! I think it would do the pattern if flown with a light touch. If you want, I'll run you off a copy of the patterns and mail them to you. Just PM or e-mail me.
Kelvin