For Custom instruments neck profile is always crafted to your measurements
You can just let me know what kind of neck profile is the One - Or you can come by and test different options which I´ve crafted before
One of my personal favorites is SLIGHTLY ASYMMETRIC profile - When treble side is carved slimmer and the meatiest part of the profile will be slightly above centerline of the neck. This will give you possiblity to have slightly thicker neck while maintaining easy reach.
(some standard measurements)
Thickness at 1st fret 19 mm
Thickness at 12th fret 21 mm
Thickness at 1st fret 21 mm
Thickness at 12th fret 23 mm
This is yet again - Defined by you and size of your hand. So basically two things that rule what will be correct measurements for your neck.
1) String Spacing & Width at Nut
2) String Spacing of selected Bridge
Example Widths at Nut: Ibanez Wizard II 43 mm - Stratocaster 41,9 mm - Les Paul 43 mm