How to change the font and size of the Chapters titles and numbers of Bjornstrup

This is a follow-up question to Question about Bjornstrup, where, in the answers, Gonzalo Medina posted a short script on how to change the background and numbers colors of a specific Chapter format.

The question I have now is: How can I change the font and size of the Chapters titles and numbers? There should be some lines to change in the script but I don't know where ....

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The font, font size and shape of the chapter numbers can be changed via:

``````\renewcommand{\CNoV}{\fontfamily{ppl}\selectfont\small \itshape} % the number
``````

The font selection is done here with `\fontfamily{ppl}\selectfont`, which selects the Palatino font.

The chapter title can be change via:

``````\renewcommand{\CTV}{\fontfamily{phv}\selectfont\Large \scshape}  % the title
``````

Here, we used Helvetica as the font.

@Ben What do you mean by completely losing the Bjornstrup style? My answer shows how to change the size (`\small` and `Large` in my answer), and the shape of the font (`itshape` and `\scshape` in my answer). –  mafp Jan 29 '13 at 16:08