How to make a glass aquarium?

I have a 2 1/2 foot long by 8 in wide and 10 in deep hole in the top of a entry way divider. I have plants in it now and wold like to make it an aquarium by putting fish in it. It is made of wood. I would like to make or buy a custom glass tank to put in there. Does anyone know how I can do this or where I can get one? I ned it to the exact size to fit. I can’t buy one at the size I need.Thanks!