Shoot through

Hi Guys,
I'm looking to make a game where an archer shoots through a series of holes in consecutive panels, so the arrow either goes through, or bounces off. Its easy in side-on view, but i want to make it 3/4 view. So an arrow seems to go behind then through, then in front of the first, then behind the next panel, where it either bounces off or, if its in line with the hole, will go through. I can do it if I split the panels up the X axis, and make one half a background object, but thats pretty clunky. I looked at using layers, but i dont know enough about them to do that. Any ideas? thanks.