For the nose ring I made several templates, first out of cardboard then 1/8" plywwod before making the 1/8" carbon fiber plate. I cut out the plate with a hole saw to start and adjusted to fit with a drum sander. The stuff sands a lot easier than it cuts with the jig saw. For the center cut out I just happened to have a 1.5" diamond drill bit that I have used to drill holes in a glass fish tanks. That cut right through the CF plate quite easily.

Test fitting the motor showed that the stand-offs needed to be exactly 3/8 " with a 1/16" spacing between the nose of the fuse and the spinner backplate. I cut out 4 pieces of 3/8" ply to act as temporary spacers between the mount and the nose ring. Countersunk 6/32 screws are used to mount the mount to the nosering. After everything was fit a bit more of the inner carbon material was sanded away to its final shape. Instead of locking nuts, small 6/32 blind nuts were glued to the back of the motor mount after their prongs were cut away. The smaller variety is short enough to fit in a 1/8" thick piece of material.