My name is Shashank Kothari and I am from MP, India. My main niche is around Tech/ technology related works. I have worked on many projects that are similar to your requirements before. Though, they were not this long. But, I have done product reviews of 3000-4000 words. My specialty is research-based content creation that is not only filled with a good amount of information. But, is also easy to read and understand.
I assure you I will deliver nothing less than what you expect if not better.
Its been almost 8-9 years since I started writing and I have worked on as many as 10000 projects to date with many clients across the world. It would be a pleasure to be associated with the type of work your doing.
Below are some of my samples attached that I found related to your requirements. Most of them are in MS Word format.