Yes
Sorry for late answer but generally yes you can if you explain that to security at the entrance. We had a situation where we had a group of 5 students and we were only allowed to get tickets for 4 at that time slot and the other ticket was 30 later. Security took care of us beautifully. They're pretty accommodating if you ask anything of them.
Yes it's down stair, you can ever take a break but you have to go back to the elevator down to the exhibition halls and work your way back to where you left off. Enjoy
You can ask if they have passes for earlier entry that you can use and leave your passes for visitors that follow.
Not sure. I don't think so though.
No the pass is for entry into the facility. However, yiu can try and enter early
Thanks! Your answer is awaiting moderation.