This looks to be quite an adventure and I'll be following along with keen interest.
I am curious about your Africa East coast portion, in particular, the Ethiopia, Kenya, Uganda, Tanzania portions. I have family based out of Uganda, and would like to explore some of the east coast portions of Africa and will have lots of questions for you about routes, border crossings, currencies, fuel, etc.
If you could, please let us know what you are taking along for personal/riding gear (boots, helmet, clothing, camping) and how it performs for you.
Good luck and a safe ride!