Does anyone know whether or not the bumpers are included in the 54’’ cylinder diameter of the robot?
https://frc-qa.usfirst.org/Question/44/questionlink
The search function of the Q and A works well, ya know 
Yes, they count as part of the 54" diameter.
Yes
Yes, but you would need a really thin robot to get outside of the cylinder while still following the perimeter rule.
The main point of the question is that it plays into how far you can extend an appendage.