Hello,
Anybody having a fitup problem with the three top sections? Mine has about a 3/32 gap at the trailing edge on each side. My guess is the center section isn't square. I'm going to call Great Planes and see what they have to say about it.

I'm going to use an OS BGX-1 glow engine with a Bisson muffler. I had this same setup on my GP Patty and it was excellent.