I have done many similar projects to this, both for my own amazon sales, and for clients as well. I will have the 4 different functions pull the information you are interested in and in separate tables of a MySQL database. then can be retrieved and exported in a combined excel file or on screen file.
I notice that you are using the "by sku" commands, which is no problem to do, but from experience, if you have the information available, I can tell you that "by ASIN" is much more accurate. Either way is no problem at all. I look forward to hearing from you. My low bid is not a reflection of the quality of work you will receive, I have bid low because of no feedback on this site yet.