jim,
This thread is making me want to get another stingray. If I do, my wife is go'na shoot me. Heres my two cents worth. I see you got the 3" mount, remember to use some hardwood triangle stock on your firewall and also use the trick of drilling 3/32 ( I think) holes, 4 or 5 per side and epoxy toothpicks through the fusalage sides into the ply firewall. With that engines weight ,that far out, hanging on the firewall it has a lot of leverage. A bounced landing might end up with the plane running over its own engine. Think strength but build light. Keep posting pics and such. I'll try to resist rushing out to get one. Piper