Quick, took maybe 6 hours. Came out 10” diameter with fairly aggressive blocking. Of course I did use smaller thread and hook.

Modified round 15 slightly, instead of slip stitches I used sc. 3 sc in ch-4 sp, sc 2 tog spanning current and next ch sp and skipping dc, sc in each of next 5 dc, then work sc and ch in ch-2 sp per pattern.