Looks good and pretty similar to my layout!
I use ahk to trigger a capslock layer and an enter layer. Similar to space fn layer somewhere posted on here.
When holding down caps lock, I trigger the arrow keys and the number pad without triggering the caps lock itself.
Tapping the caps lock twice fairly quickly will then trigger the caps lock.
As for the number pad, my "0" is triggered with a space bar, my "." is triggered with the alt key, the backspace is triggered with the ";" key, and the remaining keys where my right pinky can reach, I placed the standard math operation symbols (+,-,/,*).
I'm not too sure what to do with the enter layer, but it triggers the arrow keys in the same position as the caps lock layer. I suppose I use the enter layer whenever my left pinky gets tired.
My goal is to access shortcuts without contorting my fingers in weird position and to keep my fingers on the home row key.
Good luck and keep us updated!