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So while we can't (well without getting really advanced) produce the 3D effect (...this is a good thing!!), we can make a more Funnel Shaped chart.
Here is a blog on the step-by-step instructions for doing so...
and also includes a downloadable workbook from Public.
We cannot create the funnel chart as per your requirement. But it is possible to create area funnel chart.
Thanks for the help Simon & Triveni ... :-)