I just finished making ( the right half ) of a custom skeleton.
I would really appreciate if someone could tell me how to mirror/symmetrize it.

Thanks in advance.

btw, I already used the XSI help and the tuts on this site but they only show how to do weights and polys not bones and nulls.

EDIT: Solved! Sortof... I just copied the bones on the left side ( legs and arms ) then pasted them under the scene root. Then selected each of their roots and went Selection>>Global Transform Then rotated them along the ?(I forgot already ) axis. I then made micro-adjustments and was done!