Hi!

I thought about going to the Northern Cape as well, butt I have to admit that I never thougt about doing it in less than 8 till 10 weeks. I counted around 4500 km or more!
Maybe your a bit more keen in going over 100 km each day.

To all your questions:

If you are able to read a bit German so there is a similar thread right now on the bike forum. You find it here

If your not able to read German, I would be glad helping you to translate the major facts.

Thomas