Box and Whisker Chart (candlestick extension)

I am trying to create a Box and Whisker Chart (an example is in the word document within the ZIP file). This is very similar to a candlestick chart except that:

  • The ends of the candlestick wick are terminated with a ‘T’ line
  • Median is displayed as a crossing line inside of the candlestick body
  • Mean is displayed as a Marker on the candlestick Wick.

I have created an prototype (a  very bad example) of what we need, but I think I am really headed in the wrong direction.  It seems to me extending the functionality of the Candlestick would be a lot easier, but I am not sure what direction to proceede.

Any suggestions/examples of a simpler more direct path?