16” guitars have a 25” scale, a bit longer than an ES-175, for better string tension and a bit more room in the upper register.
The width of the nut is 1 and 3/4 inches.
Fret slots are CNC machined to an accuracy of 1/1000 of an inch.
The finger board has a compound radius: 10 inches at the nut and 14 inches at the 20th fret. This is not just to facilitate string bending. The compound radius makes the action height much more consistent across all the strings, up and down the finger board. Since the finger board increases in width, it should not simply be a section of a cylinder. Imagine the finger board as a section of a cone, and you may understand the need for a compound radius.
The finger board surface is prepared dead level on the treble side, and with increasing relief built in towards the bass side. When the neck pulls up under string tension, the relief is properly balanced with a slight amount on the treble side, and more on the bass side, since the strings on the bass side vibrate in a wider arc.
The frets are Jescar stainless steel, part number FW55090-S; width is .090” and height is .055”. Jescar fretwire is manufactured to very close tolerances, so that little milling is required if the finger board has been well prepared and the frets have been installed properly. This is a tall medium fretwire that provides superior durability and playability. Intonation is excellent, and the medium width makes moving up the neck, and grabbing chords in the upper register much easier than with jumbo fret wire.
Skylark guitars have bound finger boards.
Skylark Spirit finger boards have no binding, but the fret slots are margin delimited. That is, the fret slots are machined slightly shorter than the width of the finger board, so that the fret slot and fret tang are not apparent at the edge of the finger board. This makes the edge of the unbound finger board feel as smooth as a bound finger board.
The edge of the finger board is not perpendicular to the gluing surface, but continues the elliptical curve of the neck cross section all the way to the playing surface.