I do same as Gav....except for the 360 grit? maybe 320 grit for me :p
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.