After you've picked the glass, make sure to rinse it well with water and dry thoroughly. The glass may have tape residue or cutting compound left on it that will prevent hinges and the like from being adhered. Select your door pull or handle, and appropriately sized hinge. Prep the surfaces as specified the Josh's Frogs Blog "" Acrylic Parts and How to Use Them"", and silicone your acrylic pieces to your newly minted glass top with 100% vivarium safe silicone. Allow to dry in a well ventilated area for 1-2 days, until all of the silicone/vinegar smell has dissipated, and your new terrarium top is ready for use! A Special Note on Top Venting:In regards to dart frogs, vents are not required on a vivarium to keep your frogs happy - but there are many vivarium plants that will appreciate the added airflow, and chance to dry out a bit between waterings. Ideally, a top vent is coupled with a vent along the front of the vivarium, such as in Exo Terra Glass Terraria. In that situation, position the vent towards the top back of the tank. That way, as air is warmed it will rise from the lower front to the top back of the vivarium, creating a minor cross breeze. When adding a top vent, simply cut your back top piece of glass a little narrower (1"" is fine), then silicone in No-See-Um mesh (mosquito netting) or fine stainless steel mesh after the glass is in place.