I wasn't too sure about going into detail on the exact time frame of memory loss. I mean, the technological stuff is heavily implied as super, super old, but maybe the in-story details can help this out (if not unfolded entirely in plot key points). 

I am slowly pulling more info on the Walkers. I love their name. 

There is an idea in work about stations where the Walkers will operate as a network system, enabling them to maintain a systematic supervision of the human populace, which sounds cool so yeah. I am also working on multiple building plot points so maybe I can flesh this out a bit more before I dub it rady to starrrrtrtt.