But don't discount the methods entirely - find a balance between honest criticism and honest praise. Also think about your presentation. Be sure you save some time to make your report readable and attractive. If you need help visualizing what such a report might look like, take a look at the economic reports from the State Comptroller's Office for different regions of Texas. These are not quite the same thing that you are doing, but they may give you some ideas.
Organization is very important.
Your paper should flow logically and clearly. One option is to step through each method, focusing on what each reveals about the economy of the county. Another option is to focus on key industries or sectors and then use each method to evaluate the role of that industry in the economy. There are also lots of other variations. Be sure to consciously think about organization - don't just let the paper organize itself, and don't let the methods write the paper for you.