correct me if I am wrong, but I believe even at dead bottom, there will still be an inch of glass above the sill (at an angle) because the height of the glass itself is longer/bigger than the room in the door from bottom to top edge. I remember doing something years ago (forget exactly what), that lowered the glass much more than original, but still the forward edge sticks up an inch. Much better than the 3 inches before and the whole top edge of glass above the sill the whole door width.
does anyone have total glass hidden below the top edge? is that even possible?