Depending on your comfort level with XL, you may or may not find it
easy to adapt Stephen Bullen's example of a variable width chart to
your needs (funchrt5 in http://www.oaltd.co.uk/Excel/SBXLPage.asp#Charting).
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Regards,
Tushar Mehta www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions
You can also use oomfo v1 to create Marimekko charts in PowerPoint. It's free and renders animated/interactive Marimekko charts, that can be driven live from data in multiple Excel sheets.