I built this enclosure in 2012 in a day for a little star tortoise, using only glass, masking tape, silicone caulk, tape measure, a fine sandpaper for smoothing the sharp edges after after construction, and of course paper and pencil to write the glass measurements you want cut on. Lay the bottom piece and the 4 sides on a flat surface and tape them together.Make sure all the pieces ore on he outside because at this point you caulk the inside corners. Add the top pieces of glass and caulk them in place.After the caulk sets for a while remove the tape.When the caulk cures over night you can set it up to suit you and the tortoise.This is how my finished enclosure was set for him. I forgot to mention that after the caulk cures you sand the sharp glass edges to smooth them so they are safe and you wont get cut.