The key to a successful outdoor Kitchen project is using materials that will hold up to the weather in your area. Granite is nearly always a great choice for countertops. Hard surface products such as brick and stone for the sides are also a good choice for sides of the work surfaces. There are several stainless steel frames for the worksurfaces available on the market. If you use wood framing, make sure you use treated lumber.
Stainless steel sink and solid stainless steel faucets such as the Cygnet Infinity series faucets (not just faucets with a finish) are great choices. Note: all faucets and water lines installed in areas where the outside temperatures fall below freezing should have a drain installed so the lines can be drained in freezing weather to prevent freeze damage.