>>11553676
Unless you have your own factory it's not even remotely possible to mass-produce them. One person might be able to afford and keep a single injection molding machine and produce different parts in batches, but certainly not enough for a full set considering the time and cost required just to make each mold.

A better method would probably be to design sets made mostly of Technic components and source those in bulk from a chink company (there are some pretty good quality ones out there), with the important stuff like masks being homemade. This is something I've considered doing myself someday but it's a huge undertaking that I'm not sure I have the ambition for.