Artisteer :
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It is a software to design template for different platform like wordpress, joomla etc.
To design WordPress template, artisteer had already developed a plugin for WordPress.
You can Google artisteer to download.
What you need to Do is:
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Develop Artisteer plugin to export design as an OpenCart Template.
How to develop artisteer plugin is really easy to learn within an hour.
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Contact me only if You Have experience of designing OpenCart Template.
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Budget < $250
Time < 10 Days