I buy 1/4 by 6 by 12 inch, resaw in blocks of about 4 by 6 inches using a 4 tpi blade on a band saw.
After cutting the blocks to 2 by 6 inches, I hand sand to get the thickness within .002 up and down the slab. Once that is done and all saw marks are gone I stick the slabs together with rubber cement. I don't like double sided tape. Tape will for sure leave a residue on wood and is a pain to get off other materials.
I cut out the scales, shape on a belt sander, drill the holes, shape the wedge, pin the pivot, pin the wedge with goopy stuff on only one side and do the final shaping and polishing. Lastly, I buff the scales with white compound. Some guy in Brussels taught me that.
The wedges are typically 2 degrees by 2 degrees. These angles seem to be the most common tang dimensions.