Great looking car! Glad I could help.
Someone pointed out the Rails Northeast issue. That was the one I couldn't remember when I emailed you. If you don't have it, let me know. I have it, just have to find it. I'll dig it out and make scans of the article for you.
You might want to think about a second floor inside the car that you could sandwich a steel plate in between. These cars are short and they will still need to have weight added to them.