Drawing a single box around multiple notes

[Mike Solomon]

Hey lilypond users
    I am trying to draw a single box around multiple notes.  Right now, I am
only able to draw multiple boxes around multiple notes :

\version "2.10.33"

\relative c''  {
    \override Stem #'transparent = ##t
    \override Beam #'transparent = ##t
    \override Voice . NoteHead #'stencil =
    #(make-stencil-boxer 0.05 1 ly:note-head::print)
    b16 [a b c a b b a g a b a]
}

If there is any way to enclose these notes within a single box, please let
me know.  I can do it in an svg editor if need be, but it'd be ideal to be
able to do it in Lilypond.

Cheers,
~Mike