Your going really hard core on this one! I am new to long distance bike travelling, but have done a lot hiking and in cars. I have covered vertually all countries south DRC, incluidng DRC. Angola is relatively cool at this stage, however, DRC is a different story. I was there about three years ago, but a friend worked there more recently (as a commercial diver diving for diamonds) after witnessing two soldiers executing a civilian and then having to take photos of the soldiers posing with a foot on the victims head they decided to get outa there! Remember one of the 1st crimes being heard by the new International Criminal Court in the Hague is from the Congo! I am not one to discuarage something like this, and I am not doing it, just go into the situation with open eyes. You will probably be fine, however, just bear in mind this is not the East Coast, its a whole new ball game.
Please keep us up to date on these plans (I may drive up to check it out for myself again).