I tried one more time to get a blank looking decent on all sides. It looks accurately assembled but mistakes are magnified when turned. I will move on from this. I cut the blank into thirds and reassembled.
Good try though!
What size are the small through squares?
It looks an Incra miter gage. I would have adjusted the miter fence to be right up to the saw blade. Too much space allows error. I can see the differences in the little pieces at the cut stage.
I really like the pattern Alan. Getting the alignment to match on the 'inside' is very, very difficult. Everything looks close on the outside build-up, then when turned it shifts. However, well worth the learning cure.