I think the gun storage area is for shotguns or lever guns without scopes. I figure that I need to take their storage estimate and cut it in half.
We just put a safe in my parents place. It was bought from a local safe seller, and he has all the equipment to move it. It was brought to the house on a unmarked trailer that had a hydraulic floor, towed by an unmarked SUV. He has a stair climber, but it wasn't needed. He had slide strips, strips of teflon screwed to pieces of Oak, that had foam rubber on the bottom. It was really easy to slide the safe into position on them, then tip the safe to get them out. It was leveled with regular door shims, so the safe door would stay in whatever position it was in when open. IIRC, 72" H x 42" W x 28" Deep
Best of all, he said that if I'd help with delivery, delivery was free.