Regarding Yu Sheng, the restriction of facility size is easily solved; this valley has plenty of space and there are also many "subsets" and "secondary spaces" connected to the valley. Allocating a special area for Erin to carry out production is an easy task.
But material constraints pose a big headache.
The materials needed for mass-producing puppets are mainly divided into two parts: conventional and unconventional. The conventional part is clay (or any moldable base material) and alchemy materials, the former can be found abundantly in the valley, and the latter can be bought in any desired amount from outside, which is not a problem. However, the unconventional part consists of the Spiritual Fox Mysterious Iron for the puppet skeleton and spiritual blood as a "catalyst," and the "supply" of these two things has long been an issue.
