Since there are a lot of instrument builders on here what about a fretboard app that would let you select scale, number of frets and length and width of board
While not in Easel, there is a tool for this listed at: Shapeoko CNC Router, Rigid, Accurate, Reliable, and Affordable
LoboCNC Fretboard.exe at http://jrkerr.com/lobocnc/userapps.html