This is to minimize the effects of morning and evening shadows in the box. This makes the best use of the sun throughout the day. See Figure 2. It does not interfere with loading pots because the door opening is wide. The nose also forced me to hinge the door on one side.
Space is needed in the kitchen for the door to swing into.
Preliminary comments on the design include appreciation for the large entry. The typical four reflector solar cooker design doubles input energy, resulting in a more forgiving device. This box, with no external reflector, had to be very well built to achieve similar performance levels. Since this cooker is part of someone's home, it had to be attractive and durable. To resist weather, flashing and caulk were used on the prototype installed in Sonora, Mexico.