RE: MK Silent build
I had 2 of them, painted, and they flew very well but were rockets (heavy at 9+lbs). If you can build it lighter (remove excess wood) the 91 should be great. I had 120AC's in mine and if they were a bit lighter they would have been perfect. They were perfect as trikes for those nose high take-offs and landings. We 'fit' Spring-Airs in ours.
Does yours have the fiberglass cheeks?
I just found some pics (I gave it one chance in my stash and they were on top... post soon, but NO hair comments... I was a kid with NO sense of style in anything except planes lol)