Mark sent me a photo of the Red Spruce ladder braced Brazilian Rosewood back (below). Mark uses a 12’ radius dish.
Mark also told me that he thinks that the top bracing refinement is now complete. After trimming some material from all the braces a little bit and brought what he calls the “ring+ mode” (shown in a prior post) down by about 15 Hz to where he wanted it. He will evaluate the top again tomorrow with a “rested ear” in the morning and run a full set of Chladni modes. If he thinks it is as good as it can be, he will prep it for being glued to the rims.