Classical Guitar with bolt on neck

[Ron Belanger]

I am doing a classical, well somewhat of a hybrid as it's for a steel string player who wants a slightly narrower neck -1 15/16 - than a normal classical and a slight radius on the fretboard - 20 in.
What do I need to consider regarding fretboard and neck to body geometry? I understand that those who build with a slipper heel plane in a slight taper in the fretboard about 1/32 in. from nut to 12th fret.

[Waddy Thomson]

Totally depends on the geometry of the guitar top vs the angle of the neck to produce a 3 - 4 mm action at the 12th with a string height in the 10 - 12 mm off the top range at the saddle. Most classicals have something of a forward angle on the neck to achieve the right action. Some are flat. Depends on the doming of the top in the lower bout.

[Ron Belanger]

Thanks Waddy