Improving guitar fretboards

[PianoguitarGuy]

Here is my code for a C minor scale on a 6 string guitar 2+ octaves.  Is
there a way to make the numbers smaller to fit inside the 'dots'?  Is there
a way to place dots between the strings to mark the inlays at frets 3 5 7 9
12 etc?

Thank you so very much.
http://old.nabble.com/file/p32255163/CminorAtFret3guitarfretboard.pdf
CminorAtFret3guitarfretboard.pdf 

\version  "2.12.3"

  \include "predefined-guitar-fretboards.ly"
  \include "english.ly"

\paper { 
 default-paper-size = "letter"
 NonMusicalPaperColumn #'padding = #20
 system-system-spacing #'basic-distance = 18 % default was 12
 page-count = #1

}

\header {
  dedication = ""
  title = "C minor Scale"
  composer = "Traditional"
  tagline = ""
}


\addChordShape  #'MinorTriad
                                #guitar-tuning
                                #'(
                                (place-fret 6 3 5)
                                (place-fret 6 5 6)
                                (place-fret 6 6 "b7")
                                (place-fret 5 3 "C")
                                (place-fret 5 5 2)
                                (place-fret 5 6 "b3")
                                (place-fret 4 3 4)
                                (place-fret 4 5 5)
                                (place-fret 4 6 "b6")
                                (place-fret 3 3 "b7")
                                (place-fret 3 5 "C")
                                (place-fret 2 3 2)
                                (place-fret 2 4 "b3")
                                (place-fret 2 6 4)
                                (place-fret 1 3 5)
                                (place-fret 1 4 "b6")
                                (place-fret 1 6 "b7")
                                (place-fret 1 8 "C")

                                )


\storePredefinedDiagram #default-fret-table \chordmode{ c'' }
                        #guitar-tuning
                        #(chord-shape 'MinorTriad guitar-tuning)

mychords = \chordmode{
   c''

}

<<
   \context FretBoards {
      \set stringTunings = #guitar-tuning
         \override FretBoards.FretBoard
            #'size = #'7
         \override FretBoard
            #'(fret-diagram-details finger-code) = #'in-dot
         \override FretBoard
            #'(fret-diagram-details fret-count) = #'9
             \override FretBoard
      #'(fret-diagram-details dot-color) = #'white

   \mychords
   }

   \lyrics {
      "Cm - C natural minor scale"
   }
>>

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