it is just 1 unless it says 6 pack in the title and description.
I would recommend at least 10x11/4 and 12's would be better.
Hi, yes they can be glued together as that is how they make plywood. I would also screw them together as well.
Yes but you need to make a box with sides on all four sides and a center support in the middle to keep it from caving in when you walk on it. Or make a box as above and use a piece of exterior plywood like a half sheet handy panel. That would be a little stronger.
Yes they work great
Yes you can get them in4-6-8-10-12-14-16 foot boards
No they really need to be double the thickness
many times less than .75in
I would not trust them
Yes. And upload all the videos of the ambulances rolling in