first of all Genius and Bravo mate. The problem begins and ends with intra African trade agreements. How much capital are you working with? As you know you will have to have extensive political and inter governmental understanding which is very difficult to come by. Additionally, you need a looooot of money. Drawing up an international agreement will require a lot. If you want to do this you will probably want to become or became very connected to a head of state. Reach out to me and I can give you the full details on where you want to go.