Do you have a mclendons where you are? I go to my local one and buy my glass (Double Strenght) for the light stuff I do, and they will cut it to size for you at no charge. Then silicone it together and silicone it in the tank. If teeth is what you want then go with acrylic and you can get that at the hardware store of your choice. You can cut it on the table saw or dremel ect.... Then you know the rest.
Who is drilling the tank for you?
Also as I mentioned in your other thread if you want to drill then you can drill the tank across the back and put an external overflow on the tank, then you will not lose any room inside the display. The holes will spill into the overflow giving you surface skimming and you can put eggcrate behind the holes in the overflow so you don't have to worry about fish going into the overflow.