Ok Brajesh,
I have review the bp-mag code and I see where you do some different things with the header and nav portions of members and groups in that you add the actions to the before_member and before_group_content.
If I want to reverse the order, put the nav on top and the header below, is it enough to delete the actions and add them in a different order?
I am successful in shortening the header, but I am having trouble changing the order.