Hey there!
I am currently a student studying in the United Kingdom, and of couse my native language is English. I would love to go through your entire proposal to make sure that everything is correctly worded and that everything makes sense. I can see in your description that there are a few minor grammatical errors, however no meaning is lost, and therefore I feel that working on your project will be a satisfying and enjoyable experince. As the document is 35 pages, I would be able to provide a very quick turnover. I believe that I would not only be able to fix all errors and mistakes in your document, but also improve the document too, making it even more persuasive and impressive for your client in the US. Furthermore, I would be more than satisfied with your minimum budget, and for this reason, saving yourself money too!
Regardless of how this job goes, I hope you are successful with your proposal!