In the automotive world, windshields are not typically tempered, they are laminated safety glass which can be cut. All the rest of the glass is usually tempered
However - before you have anyone attempt to cut the glass, make a new template. It is pretty likely that it will break and then you will be left trying to make one without a pattern. If the glass is curved, you are in for a pretty expensive project if it must be replaced. Custom curved glass is very high dollar.