You will probably get the best answer if you contact them. Every cottage gear company has a contact page. This is especially true of you have purchased stuff from them.
Zpacks used to have a photo on its web site showing its shop with all of the sewing operators at work. At the time, it was five or six people total. In many cases, the cottage companies are simply one-person companies, but then there are independent sewing contractors that each work in their own homes and supply the finished gear to the manager.
I suspect that the answer is: they are all different.