PM me and I'll discuss exatcly how I would do it if I were you, and maybe work with you on the designing (Im an architect and work for an engineer) if I can benefit from it....
My majorly huge hand-made Focus RS replica build:
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My RS conversion is For Sale: http://www.focusfanatics.com/forum/vehicles-sale/578185-sale-rs-mk1-conversion-2003-focus-svt.html