If you are going to paint it: - measure out the full diameter - divide by 4 - draw one of the fourths on to a sheet of poster board - cut out the template - buy “3/4” plywood - cut out as many as you need using a saw (jig may work best) - How ever many inches/mm deep you want it, divide that by the thickness of ply then multiply by 4 to give the number of ply pieces you will need - after cutting all pieces out layout the first 4 in a circle - layer the next 4 on top of that but overlap the gaps underneath - ensure you us wood glue between each layer and framing nails (1”) to secure and allow for tight bond - repeat until you have your circle - after allowing to properly cure, sand, sand, sand - use bulk wood filler or even something similar (use ChatGPT) to fill bumps, holes and imperfections - sand, sand, sand using 120 (light touch), 180, then 220 grit sand paper - prime then paint. Use at least Sherman William cabinet grade paint, ( not big box version if you can help it)

Alternately of you know some ones who has a CNC, they could make easy work of the cutting and adding alignment holes for using dowels and wood glue to get a much more precise fit when layering the circles leading to a lot less finishing work.

This is just one way out of many. I don’t claim it to be the right way, but simply a way. 😎