What I am wondering is if you could make a basic 1 or 2K texture and then make linked duplicates and perhaps do what the guy did on Announcement #3 somehow?
Add some shader/ mask details to each? I wonder the performance impact doing things that way. You would want a simple shader layer/mask setup on the single wall panel (maybe two separate textures on each layer that compliment each other like you have shown there) but then you could paint the mask or make a procedural mask for each physical tile with use of global coordinates or similar??
Am I talking Cray Cray here or am I leading the Free Crayson in a good direction of feedback?