Hi I have worked on similar tasks and have a couple of projects where I added rotating/zooming bars to the canvas object. Your existing WP plugin uses same canvas technologies so I guess the only timetaking action of your project will be analysing the plugin code to find out where and how to insert thoose bars without breaking other functionality. This can take around two days not more.
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I have successfully completed hundreds of different WP projects starting from minor theme or content updates to huge and complex WP plugin development and dozens external API integration tasks. I have 11 years experience in Web Development, 5 years with Wordpress. My favourite technologies are PHP, MySQL, HTML5, CSS, JavaScript + Ajax + jQuery + libs.
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