I did not box in my x frame. I really don't see a need for that, but I did weld it solid where the rivets held it together in the center and the outer corners at the frame rails.
my has not been chopped, I like the way it looks stock.
here are a couple of pictures showing the window measurements. Any other questions, feel free to ask.
I have been looking for the back glass interior trim moulding for years and cannot find one. if you ever hear of one, please let me know.