My friend told me near the same thing, last night ; he is the guyNot if the weight saved by using struts lowers the induced drag to less than what the cantilever wing would give you.
And what does have to do with the single tube idea, please explain !My suggestion is to use professinal blueprints of aerobatic airplanes. There is an airplane with a great flying characteristics and at the same time with a high level of durability - Zivko Edge 540.
I've found an option to outline blueprints here: Zivko Edge 540 Clipart - Download Aircraft Clipart Images and Blueprints in PNG, PSD
Or you can use free ones from this source: https://www.f3m.com/spain/3view/Imagenes/fai edge 540.jpg