This plugin will provide an "Availability Chart" on the product page. The chart will be a graphic representation of how many items are left in stock for the variation.
On the Edit Product page when the product type is set to Variable add an option on the General tab for "Availability Chart"
Location of option:
When the option is enabled the availability chart will be displayed on the product page.
On the product page, the availability chart will show below the main content. You can use the action do_action( 'woocommerce_after_main_content' ) to add the template.
Please put the HTML for the availability chart into its own template inside of this plugin. You can use something like this (http://www.maxdesign.com.au/articles/percentage/) to style the bars, or use any other technique you want.
Example of availability chart
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