Is there anyone around who I can buy a pre-slotted fretboard from that sets the scale to whatever the buyer wants? I don't need one just yet, but I'm curious. My planned board will have 22 frets with a 19.75" scale, but only 17 frets will actually be on the neck. The last 5 will be part of an extended fretboard.
You can buy one from LMII. Select your fretboard, then click the customize button to add your scale, number of frets, etc. They also have a fret number and board length calculator on the site, which is pretty handy!
Do you have a link you can share?
Allenguitar.com also does custom fretboards.
Luthiers Mercantile is the place to go to for custom fretboards without question and they have a variety of wood to choose