Yippee!!! Your bike is beautiful!!! LOVE the Brooks with the white cables. Classic! What kind is it (the bike) I can't quite tell.
Congrats on ditching the bus for the bike! Does it take you just as long, longer, or a shorter amount of time to get to work now?
I don't know about the step-through with disc brakes. I'm sure you could have a custom one built that way, but I don't know that I've ever seen one (but I could be totally wrong on that one).