I'm in the process of modeling a stave church, I've built it  times already. I had to because I'm learning from my mistakes while learning new things about blender each day.
My question is should I UV-unwrap each piece as I complete it, i.e the clock tower on side of building, the overhang roof etc? Or would it be OK to build the entire thing, then do the process of unwrapping?
I'm dying to get it done and UV-mapped so I can texture it either in Blender or import it over to UE4 and texture it there, or is it better to everything in Blender and then import?