Did you leave draw strings in them
No, we use tension springs to pull wires through them, made sure nowhere to use less than 120 degree bends.
Most pipes were filled directly however after the build with two 1.5mm2 wires (800V isolation) for mains or low voltage , currently most of them have 12V for my own led drivers. And cat6 for data and voltage to my leddrivers.
and a diagram of what goes where as well.
Yes have them all on paper, but should digitize them.