kit looks great Rob, so your daughter is a lefty hey.
I wouldn't sand the body any more than about 400 grit as higher grits polish the timber surface and it won't take the stain as well.
Same with the headstock face. Go nuts on the neck though can go to 1200 grit. Think you said natural colour neck.

Rick was having issues getting the colour he wanted but he is very close (I think). I think he's being to hard on himself !