you should hook-up with or ask around for M.S.E (mzantsi street expressions), Osmic and his crew, Dj Blaize, Atom those names will get you to the right people. I guess you have to hook up with them first cause I heard stories where dudes had to be vigilant, know what I mean. That shouldnt discourage you, come through (and take pics!). The was like a whole section in parktown bombed out so i guess places like that will be "legal". Do something in Soweto, represent.
salut