The interior is still very original. Carpet is newer,(lets face it, it wont last forever) same with the curtains. The has been revarnished, I don't know about the seats but I can imagin they have been redone.I also don't know about the logos. They are done very nicely done. And look original to me but I don't know.The glass has also been changed I believe.
If you ask me it does not matter what the carpet looks like, what the upholstery is made from, or weather or not the glass and Rio Grande logos are original. To me the Durango is very original if you compair it to the Alamosa, and Chama.