I figured out how to kitbash one from a pair of FVM models, but you need a milling machine. It would be easier to 3D print one at this point.
You could use the Fvm car as your basis and follow Keith's method from the MR article.
Maybe not as clean or accurate as a car made with a milling machine, but Mr Kohlmann's results were quite good using the old Fine N Scale resin model.
To steal a quote from Lee a little putty a little paint, make it something that it 'ain't...
I have the article scanned if that helps at all...
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