A: Yes, very sturdy box that is very adaptable to length. Built in handles. If used for transporting between locations add velcro to outside of box for easy access. Highly recommend product.
A: I will be sure that the box open enough to the size you need. I also will rap up the mirror very well to protect it, use card board, bubble rap, or a blanket. I will also tape the box to secure it and won't open with the move. I hope that will help.
A: No, my 65in just fit.