Is there much weight to be saved swapping the electric windows and mirrors for manual items?
Unless you're racing, quite categorically, no.
Put manual mirrors and window regulators in my ph1, not due too weight saving but after a small fire wrecked all the switches it was easier/cheaper to do it that way.
doors take about 10 mins to swap over and mirrors are easier. Less stuff too go wrong as well, the simpler the better in my eyes.