I just completed building a Sliding Glass Door with built in European Ventilation (vents above and below the door) all built into an old Aquarium.
I documented the process in my "Detailed-journal-colored-foam" Journal on Dendroboard.
This link should take you directly to the build info.
Detailed Build Info: Aquarium Modification: Sliding Front Door / European Venting
I added this reference here because I frequent this site as well as the DB site.
This tank was on hold for quite a while as I figured out to get the front glass off of the tank without removing the plastic trim. (Turned out to be quite simple, but it sure had me going for a while.)
Dave