I'll play (and not be a party pooper beyond wishing that this question was about the G&L custom shop instead of Fender)
Precision
Couldn't care less about body wood - ash, alder, poplar, whatever.
Black finish
Anodised gold pickguard
Reverse P pickup (would like some slightly hotter/overwound bobbins compared to normal)
Maple neck, I guess. Why not throw in the skunk stripe?
Ebony fretboard with 21 frets, not 20 (that never made sense to me)
Block inlays
Matching black headstock
Gold hardware (whatever their top of the line stuff is)