Thanks for the feedback so far guys. Especially thanks for the pic Henk, will come in most useful for prt. 3! 
You know what size the wheels on the Peugeot are? I should be able to get the proportions of the rest of the car once I got that, think it's 18" probably?
Here's a pic of the engine/ gearbox and dummy around which the rest of the car was drawn (warning, might look cartoony):

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If ignorance is bliss, I'm ecstatic.
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