John,
I want to thank you again for putting me on the right track.
Note in this museum display, the angle of the triangular mounting brackets...which matches the underlying wooden struts! So there's my answer,..these are just inboard of the side panels!
The cradle assembly does not appear related to these as I look at various other images.
So to venture an educated guess, I am going to postulate that these are roughly aligned to take advantage of grain alignment to the expected forces of T.O and landing????
Thanks again John!