If we look at the way in which old-time "stick and tissue" open fuselages are made, we find a mix of vertical and "45-degree" braces...as the common structural girder.

If you remove the 45-degree braces, the structure becomes near useless for its purpose. Try it.

Seems to me that the typical model' wing comprises an infinite number of vertical braces. Now, if we applied that constructional method to a fuselage structure, we would have, in effect, a fully-sheeted fuselage side.

But, who would cut a sheet side with the grain running vertically?

Then again, the academic opinion would seem to say that the side should comprise two lamina, each with its grain oriented at 45 degrees.

I seem to recall seeing a cut-away of a (Wimpy?) wing which had its main spar braced by "45-degree" members. They used to say, "triangulate and add lightness".