My old yellow Waco is still flying with my Zen 23, but I added the B & B straight pipe to her. God, I love the loud racket that she makes! Really cool sounds at half throttle and the sounds you get when she does an aileron roll are neat. I also could bolt the fake motor to the front of the Zen. I just mounted the plastic on a thin sheet of ply and cut her out to fit and cool. Only the bottom plug hangs out and the pipe. Everything else is enclosed. A little detailing on the plastic motor, looks cool. The only problem that I have had with the landing gear is the splitting of the covers. I filled in the cracks with canopy glue, same as I keep those pesky fairing in place. Bye and large, my favorite and most dependable flyer of my fleet.