I do same as Gav....except for the 360 grit? maybe 320 grit for me
One other thing JP, it looks as though the transition form the maple fret board to the headstock is at a bit of an angle. Jump on Juddernaughts build diary for his Tele to see comments. I wouldn't freak out about it, again it looks like your nut is in the right place, just the transitions at a bit of an angle.