Defining custom noteHead scaling problem

[Jiri Zurek (Prague)]

Cheating from 
http://old.nabble.com/defining-custom-note-heads-td17430564.html#a17626150
the older post   I was able to define my own special noteHead, combining
three glyphs together, calling it a tripleNote. It works perfectly in the
default score size. However, when I resize the score to smaller one, the
tripleNote is not scaled well - the third noteHead appears too far from the
other noteHeads. I suspect this is because the offset values are hard coded
into the tripleNote definition. Is there a way how to code these values
proportionally to the score size instead?

% Lilypond begin
\version "2.12.1"

tripleNote = { \once \override NoteHead  #'stencil =
#ly:text-interface::print
            \once \override NoteHead #'text = #(markup  #:combine 
#:musicglyph "noteheads.s2" #:halign 1 #:musicglyph "noteheads.s2" #:halign
-0.1 #:musicglyph "noteheads.s2") }
{
\clef "G_8" 
\override Staff.Stem #'transparent = ##t 
\tripleNote g
}

\score {
  {
  \clef "G_8" 
  \override Staff.Stem #'transparent = ##t 
  \tripleNote g
  }
  \layout {
    #(layout-set-staff-size 15) 
    \context {
      \Staff
        fontSize = #-4.7     
        \override VerticalAxisGroup #'minimum-Y-extent = #'(0 . 0) 
        \override StaffSymbol #'staff-space = #(magstep -8) 
        \override StaffSymbol #'thickness = #(magstep -4.5) 
    }
  }
}
% Lilypond end
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