Excellent "how to" presentation.
Thank you Fraser
Gordon
Epoxied a test piece with a "wing" butt joined to a "fuselage" to see how it was for strength.
The spruce "fuselage" section was held in a vice with the 1" wide x 8" long x 1/8" thick "wing" horizontal. It was marked in 1" increments from the root to 5 inches.
I suspended a 16.5 oz weight (467 gram) at the one inch mark and it was fine. I moved it outboard an inch at a time until it failed at five inches. That's 82.5 in/oz of torque or about 0.58 nm. I was quite surprised by the strength and should hold the wings on with normal handling.