Don't know about the Zip drive install.
To remove the bezel, open the side door. Then...
1. From inside the chassis,behind the front panel,push the two bezel tabs forward to release the bezel from the front panel.
2. Disconnect the bezel from the hinges on the front left side and remove the bezel from the computer.
NOTE: Be careful when pushing the bezel tabs. I broke one on my G4, but fixed it with Super Glue.
Cheers, Tom