How are you making the connections between the steel tubing.
It’s what I would be doing agree. Nice work on the plane.Brazing, I can weld and solder so should do ok with brazing.
I have plenty of silver solder and 35 years experience of putting it to copper. Did not know i could use actual silver solder on steel. Heck, i even have a torch or 3.
I brazed with coat hangers as a kid and remember very strong results.
I would silver solder rather than braze.