You asked for thoughts......
Compared to the entire custom-built aircraft community, there is an insignificant number of wood aircraft such as the Piet and FlyBaby being built. I am assisting a friend who is building a FlyBaby and he is only aware of one other plane currently under construction. There would be a few more Piets...but very few.
I can't think of any other wood components of the FlyBaby other than ribs that would lend themselves to quantity reproduction. As Ron stated, rib construction time doesn't even register compared to total build time. These are custom-built planes in the strictest sense which means components are built to fit each other, not necessarily to fit the plans. Tolerances can accumulate, and by the time fabrication reached the point of needing prefab parts, they may not fit what has been previously constructed. I realize this may be difficult to understand if one has never built one of these wood aircraft and doesn't appreciate the uniqueness of each particular airframe.
In regard to total time savings, as a general rule the airframe comprises about 1/2 of total build time. In other words, when you have something that looks like the bones of an aircraft, you are only half way to a flying aircraft. This means saving a little time on prefab ribs is meaningless in total build time.
However....if you want to take the time to set up production of ribs and enjoy that process, then do it for the educational and recreational benefit. But I doubt the CNC-capable builder will save any time, precision or gain any safety over the builder who is handy with a bandsaw.
The only wood aircraft I've seen that relied heavily on CNC process was a wood version of the TEAM Airbike but I don't know if that kit ever came to market. It was a totally different design from the Piet or Flybaby consisting primarily of plywood for the entire airframe. While I was building and flying a Legal Eagle a builder geared up for milling the nose ribs, but again there was no saving of time, just the fun of knowing it could be done.