Lumpy Cams

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This customer received 42 t-shirt designs from 13 designers. They chose this t-shirt design from SSDD as the winning design.
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Please see photo of my idea attached. This is exactly what I want, but I need your expertise to improve it :) I want it to remain a black/grey sketch design, as it's to be printed on white shirts. Target audience will be motor enthusiasts so I don't want anything that looks like graffiti art. Think mechanical / industrial. I would like the camshaft along the bottom to remain a drawing but the cams themselves could be thicker and all match in size. They are supposed to be comically larger than real cams. This design will be the logo for our clothing company and it will also be printed on the shirts.
I have found a font in Openoffice that I think will look good, called Chalkduster. I have uploaded a photo of it. This should match the sketch/drawing idea.
Updates
I have updated my brief with another photo of some font that I like. Have also added to the 'must have' section
Added Tuesday, September 10, 2013
Target Market(s)
Motor enthusiasts / car fans
Industry/Entity Type
Clothing
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
Elegant
Bold
Playful
Serious
Traditional
Modern
Personable
Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Must have
- Letters must be pushed up or down according to the cam that's under it, like in my photo. Also I can't stress enough that I want it to look like a SKETCH. A lead pencil drawing.