The bowl blank really is not difficult. The pine and the appleply are all 3/4 inch thick x 11 inches long x 3 inches wide. I glued the pine to both sides of the long sides of the appleply so that I had a pine,appleply,pine board 3/4 inches thick x 9 inches wide x 11 inches long. From there I carefully centered the pattern. The rings were 3/8 so with the wood 3/4 thick the angle to cut the rings is 26.5 degrees left side down. Wish I had a video camera so that I could make a video tutorial on the process,alas I can not afford one at the moment.
DW