Robot Access Period Questions

[magnets]

So, our team is doing a district event this year, and we had a few questions about the robot access period mentioned in the administrative section of the manual.

The purpose of the access period seems to be to make up for missing the first day of a normal regional. We get to unbag the robot for 6 hours. During this time, we can "practice with the robot" or "perform any activity they [the team] would normally do during the build season". What is the limit to the amount of changes I can make? Could I unbag the robot, remove my shooter, and put on my practice robot's shooter? Is there a withholding allowance? Could I unbag my robot, and replace the shooter, drive system, and pickup?

Or, could I bag the practice robot, then on this day, switch the real and practice robots? Or could I bag the practice robot, then replace the drive/shooter/intake with the real version?