If you were on webcam right now, you'd know that I am almost literally drooling. Are you going to make the widegauge (7', IIRC) railroad that operated above the plant?
I went to school in Bethlehem in the early 90's and that place was still a railroad mecca even then. I didn't know about the widegauge when I lived there, but rather found out about it in Railpace.
If I can be helpful in any way just ask.