i second that. no need to do RGB imaging on a DSLR. with regards to Polar alignment. they are less helpful in the southern hemisphere due to the lack of a pole star. the best method i found was doing a rough alignment with a compass and then refining through polar alignment
this video should be helpful, though you probable don't need to drift for as long as he does (he goes through polar alignment during the last 10 mins)
https://www.youtube.com/watch?v=zQB6UnrTEEM