How many production budlings should I build to complete Ficmas?

This is my first Ficmas event and I'm enjoying it. I'm trying to plan out my Ficmas manufacturing center, but I'm wondering how many of each production building I'll need. For example, is just one constructor to make branches, one to make the candy canes, etc all I'll need? I know having multiples of each with make them a lot faster, but I'm ok with producing enough to complete the event, then just store the extra resources for next year. Would just one Constructor, Smelter, Foundry, etc., to make each Ficmas item good enough? I do plan on making a lot of the trees that produce the gifts to supply all the factories. I'm thinking I'll just end up letting the game run in the background to produce the items while I do other stuff around the house.