Summary

Have grandkids, first thought was protecting the hands, also a version with a blank face for adding a custom face. I purchased a 2.8" clock module from Amazon. The mounting hole is 64mm diameter and the 2.8" fits just within the circle of the original face. Be ready to do some slight filing to assemble, but this is a fun and rather lengthy project to build. You can see OldManJohnson's original Decorative Clock at https://www.thingiverse.com/thing:4981582

At the time of posting, I'm about 1/3 through this build.