ah sorry just re-read your post. If the project network template is entirely based on excel and its source data then I'm guessing you can't third party your way out of it haha. good luck!
warning:don't open these links if you're using mobile data!
Shanghai gigapixel image - http://gigapan.com/gigapans/66626
Barack Obama's Inaugural Address gigapixel image - http://gigapan.com/gigapans/15374