Originally Posted by Mr_D
Windshields are safety glass and not tempered. They have a sandwich of at least three layers, two glass and a plastic in between.
While true of windshields, side and back glass is usually tempered glass. Tempered glass is made by cutting, then put in an oven. After heating, it is cooled quickly by fans. The surface of the glass is cooled faster than the interior, so the surface is under compression and the interior is under tension. When broken, the glass breaks into small nuggets with few sharp edges. Because the edges of the glass also cool quickly, the edges are usually ground away until this weaker glass is removed. Tempered glass is typically 5-10 X as strong as untempered glass.
When I said, "I hope you're having tempered safety glass cut to fit." I meant that a qualified shop would cut and temper the glass for the frames the OP showed in the photos. This is not a DIY project, but installing the glass, once cut, can be.