Thanks for the images. Good idea. I may ask him to send me the extra mounts when I order from cncfusion. Did you mill out the recess entirely or rough cut it and then finish it with the mill?
Also what are the 4 holes in the sides of the spacer?
Lastly I teach photo and digital photo and your images are very good. Excellent focus and lighting. Clearly show what you wanted them to. So don't knock you photos too hard I wish that all my students coming into the class had your photo skills. They would be a lot farther ahead.