Ah, yes I remember that frustration. It gets much sturdier when the plywood piece at the front top of the cabin is installed along with the music wire pieces. The music wire has to be wrapped and soldered, also. The landing gear is constructed the same way. That's a fun job. Hopefully, you've had some experience soldering.

Have you considered making the cabin door operable? It is a bit more work, but it adds even more scale-like realism.

Phil