This is part of working backwords….
You CANNOT do the bid, without knowing the specifics of your core WOOD colors inside…
What if you are sick of the generic white plug socket fixtures….and want them to be the same color as your paint…. you have to commit to your paint colors by the framing stage…since the plug sockets go in right after framing…
If you are not too worried about the color of sockets… you can still pick the cheap old fashioned internals… vs. the more expensive sleek internals… of course your contractor/sub will go with the generic old fashioned one…YOU DO NOT WANT.