Tell us about yourself!
I did something very similar for an entire Christmas tree, I have 2 suggestions to help a bit. 1) get a few inches of 1/4" square copper tubing and heat the end with a lighter/torch and use that to cut the hole in the ping pong ball. Its cleaner and much faster. i was able to do around 100 in 10 minutes.2) buy much cheaper ping pong balls (like these https://www.amazon.com/dp/B01IEB5T2U) the cheaper ones don't need to have the writing scrubbed off, and have an actual seam on them so you don't get that dim band around the ball where they overlapped the shell to be smooth.cool to see this up here though using the same LED boards i used.
"Brick and Mortar" Cutting Board
Make a Massironi shelf
I created an account just to give a shout out to your clear acrylic & velum solution for the diffuser. I experimented with different white acrylic thicknesses, and different vinyl frosting solutions and wasn't happy with the result. after testing a $0.60 piece of this stuff, i was so pleased i tore apart both of my 512 light versions to replace them with this.