I made a 24" door round for my front door for Christmas. When I realized how quick it was to cut, paint, and assemble I made another one for my son for a Christmas present. Total time was a about 1.5 hours. See other notes in the xcs files I have attached.
30 Second cut time!
24 Minute cut time (used 2 12 X 20) Birch plywood from Home Depot
Enjoy! This project is quick and turns out beautiful!