I created a thread on TWC where I think this certain source will be useful for mods, here is what I put, and I thought it might be useful for this mod, so hopefully it will help.
I have been looking around randomly and found this great website, where they discuss about historical events in history and debate about, anyway there is a section called historical pictures gallery, where they create historical accurate items from history, such as hats, buildings clothes, etc. They have created them from different era's in history with photographic software.
Anyway I thought those pictures would help mappers, modellers etc and give them a basic idea of how things were in a specific era
They might not be in our specific timeframe for this mod but there are some if you scroll and look through, also as i am a member, I could create a thread that is specific for our timeframe?