At full size, the outer diameter is 200mm, the inner diameter is 100mm, and the depth of the bowl area is around 50mm. That should make re-scaling pretty easy math. The bowl in the images is scaled down to 90% X by 90% Y by 75% Z. This is a great print to use the adaptive layer height tool in PrusaSlicer with. 

For more details you can check out the article for this print at 3dprintedman.com!