Yes, there are more German speakers here, JGoldman.
I am thinking hard about your questions but can't really think of any expression I would use. I guess I would say 'taffes Mädel' for something like tough chick.
'Haltbar' really does not work for a person. You might have material, clothing or milk that is 'haltbar' - durable, long lasting as CJ already mentioned.
Nobody uses 'Biene' anymore.
I will see my nephews today (15 and 26). I'll try to remember to ask them. They seem to be closer to this kind of talk than me... :wink:
As for positive expressions - 'taff' is not negative in my view.
My favourite place for language questions is this:
Leo
Go to 'Forum' for specific questions.