I'm currently building one with an OS 1.60 with a 18x6 on it. I'm in the process of recovering the whole plane.
I could'nt handle the see through ultra cote. I've had two of the US 40's. Still have one with a OS.61 on it. I've
"Beefed Up" the firewall and landing gear on all of them, but always just epoxyed the wing halves together and
have never had an issue with it.

Rick