Reconstruction of the Sol square

[akenu]

I have reached a dead end while trying to reconstruct the Magick square for Sun (Sol). And help would be greatly appreciated. I have reached a place where I know how to construct the traditional square, but I do not know why it was made this way.

You can find my notes here: https://drive.google.com/file/d/1eDvovF1SLDoY1TI9A-rOBGgsYdzNgfF8/view?usp=share_link