You are pointing at a different pole so the Anti clockwise (E-W) movement in the north translates to the same AC movement when turned 180deg and pointed south. The design does not have to accommodate for this. Latitude is the same if you design for -33 it will work in +33 also.
If you have not already, then join the Eqplatforms yahoo group.
http://tech.groups.yahoo.com/group/eqplatforms/
Regards
Fahim