Assuming you've exceeded the 7.0 SA required to overload, who would you need to contact in order to be given permission to overload on SOLAR?
Would you need to contact both the registrar and your faculty, or would registrar be able to obtain academic records on their own?

When I went to do it, I talked to the Academic Advisors of the Faculty of Science. I'm not sure if that's the same with SOTA or whether you could circumvent it by going straight to the Registrar's office, but I only talked to the Faculty (and not the registrar).