Working with Simpson is simple. You will be surprised by the style and variety of doors they offer in their product line. If you see a door you like but would like to make some changes that service is available. Sketch a simple drawing and we will forward it to the Simpson door company. The company will then come up with a working drawing. Their doors are available in fir, mahogany, western hemlock, knotty alder, poplar, maple, red oak, cherry and walnut, 20 different glass styles and silver, black or brass caming.