The old door showing the light (and cold or heat, depending on the season) that would stream in:
Taking off the old storm door. We put the old storm door back on, but we will eventually replace it as well.
The old door off. The bottom window panel was actually a very thin Plexiglas instead of real glass.
Fitting the new door in the old slot:
The new door installed! Jason had to go to work before the knobs and deadbolt were in, so I chiseled the spots and installed the door knobs and deadbolt: