Here's an interesting idea that could make having multiple fcs a bit difficult: You have to have 4 people in the actual workshop when crafting new workshop items such as sub parts. Also, make crafting so that in order to be able to craft everything, the skills have to be tied into a specific job. You want Prudent Synthesis while on your CRP? You better level your CUL in order to get that skill. (These are just estimations regarding what classes get what skills.)