I must say I really like the aesthetics of the building you've made so far, and the defendability of the outside. Unfortunately, when we checked today, it's not entirely structurally healthy XD Some of the second floor pieces are already down to 20% stability, so putting another floor on it will be hard if not impossible unless you either redesign the lower floors, or put pillars where you would not like them, so yeah, attaching a separate storage at the back might be the best option. You'll still need storage specific to the crafting area, but any other materials, and any overflow from the crafting area could be put in a general storage.
At the moment I'm just making and storing building materials, and made it up to level 10. For a proper storage I need to look into all the current available materials and their products, so I can design a sensible laid out storage which basically holds chests/cupboards for each separate base material, and separate manufactured products or groups of products. It also needs to be well defended, with double walls to prevent any 'grab through wall' action, yet still easy accessible for us from the main building. I'll see what I can come up with within the next couple of days (plus some building will help me level as well). I wouldn't mind some more (temporary) storage in the current building where everybody can dump there stuff so it can be sorted later into a new storage. Throwing stuff away, other then perhaps putrid meat should be avoided imho.
I love the village idea. Would be great to have like separate living spaces, but also some community spaces like a bar/restaurant, a community (overflow) storage where people can dump their surplus for the greater good. Would also be cool if people would have a building that represents their own specialization, like weapon smith, etc.
I will be specializing in building stuff again, but that does mean I won't be able to make any armor or weapons at all, and also that my majority of points will go into encumbrance, so I will be needing an escort to move between places safely too. I'll be very depending on the rest, and quite useless when it comes to combat support... Eventually I'll be able to move a house, but at the same time barely able to swing a toothpick at an enemy..lol