For numbering, it depends on the CNC machine you’re working with and whether you want to use it to engrave labels on the parts, or if you just want numbers on each part on diagrams of the sheets, which you can use to tell you where to put taped on labels to help you assemble.
If you can do a tool change or have an auto tool changer, engrave the parts where it won’t be seen, and check this out: Bake single-stroke font text to Rhino
Same basic idea if you’re not going to engrave, except then single stroke fonts aren’t necessary.