Here is a guitar that came in for a little action adjustment and fret work and I'd like to share a couple of comments about it.
Although not the first maker to try an elevated fingerboard on a guitar, Thomas Humphrey was probably the first to do it on modern classical guitars.
This makes the strings pull more vertically on the top, creating more tension that in the traditional design.
A lot of makers now are doing this although the rise is generally less extreme.
In order to take the added tension, the top is lattice braced, although it remains being a thin top.