Full time professional XML freelancer. Top expert XSLT. I have worked a lot with the Office XML formats and there are a number of complexities you need to be aware of: nested lists, formulas, complex tables, multi-linked footnotes, images (it is a good test for selecting your freelancer to see if they actually have experience with teh OOXML format... you don't need to select myself, but if you will select a person that has no proven experience with the very complex OOXML model, your project will likely fail... you can't learn the OOXML model in a 10 days elapse time project).
So depending on the exact requirement of the template the price may vary. Please send me some examples what you want in detail. Thanks