\version "2.15.27"

rightUp = \relative c''' {
  \key bes \major
  \time 3/4
  \set doubleSlurs = ##t
  <g g'>4--\( <f f'>8. <d d'>16( <c c'>8.)
    \unset doubleSlurs
    <bes bes'>16( |
  <g g'>8.)
    \set doubleSlurs = ##t
    <f f'>16( <d d'>2)\) |
  \unset doubleSlurs
  % etc.
}

rightDown = \relative c' {
  \key bes \major
  \time 3/4
  \override Stem #'cross-staff = ##t
  % \override NoteColumn #'ignore-collision = ##t
  \override Beam #'collision-interfaces = #'()
  \override Beam #'positions = #'(-6 . -4)
  r8 <c ees g c>4-. <d f a d>4-. <ees g bes ees>8-.\laissezVibrer |
  q8\repeatTie <f a c f>-.
    %\once \override Staff.NoteCollision #'merge-differently-headed = ##f
    \once \override NoteColumn #'force-hshift = #1.8
    <g bes d g>-. <a c e a>-. <bes d f bes>-. <c ees g c>-. |
  % etc.
}

leftUp = \relative c {
  \key bes \major
  \time 3/4
  \override Stem #'cross-staff = ##t
  \override NoteColumn #'ignore-collision = ##t
  \override Beam #'collision-interfaces = #'()
  \override Beam #'positions = #'(6 . 8)
  r8 <c ees g>4-. <d f a>4-. <ees g bes>8~-. |
  q8 <f a c>-. <g bes d>-. <a c e>-. <bes d f>-. <c ees g>-. |
  % etc.
}

leftDown = \relative c,, {
  \key bes \major
  \time 3/4
  <f f'>2.~ |
  q |
  % etc.
}

\score {
  <<
    \new PianoStaff \with {
      % \override StaffGrouper #'staff-staff-spacing = #'((basic-distance . 9) (minimum-distance . 7) (stretchability . 5))
    } <<
      \new Staff = "RH" \with {
        % \override VerticalAxisGroup #'staff-staff-spacing = #'((basic-distance . 9) (minimum-distance . 8))
      } {
        \clef treble
        <<
          \new Voice = "rightUp" {
            \voiceOne
            \rightUp
          }
          \new Voice = "rightDown" {
            \voiceTwo
            \revert Script #'direction
            \revert Tie #'direction
            \revert LaissezVibrerTie #'direction
            \revert RepeatTie #'direction
            \rightDown
          }
        >>
      }
      \new Staff = "LH" \with {
        % \override VerticalAxisGroup #'staff-staff-spacing = #'((basic-distance . 9) (minimum-distance . 8))
      } {
        \clef bass
        <<
          \new Voice = "leftUp" {
            \voiceOne
            \revert Script #'direction
            \revert Tie #'direction
            \revert LaissezVibrerTie #'direction
            \revert RepeatTie #'direction
            \leftUp
          }
          \new Voice = "leftDown" {
            \voiceTwo
            \leftDown
          }
        >>
      }
    >>
  >>
}