Another source of information mentioned the aircraft will be registered either in the Ghanese or Gambian register.
At the moment a lot of weird/illegal cargo in Africa is transported by Russian aircraft. Air Cess/Air Pass/Centrafrican is one of those airlines carrying weapons/diamonds and whatever. Who knows this aircraft will be used for something we do not want to know about. For the cargo mentioned you do not need a cargo door. At least a L1011 is less suspicious looking then an Antonov in Africa.