Here are some ideas and photos that might help you design and build your outdoor kitchen.
Concrete Block or Brick
East and fast to build, inexpensive
Heavy to install and it can be difficult to construct more complex outdoor kitchen shapes and designs, such as doors, shelves, and openings for appliance.
Metal Studs and Concrete Board
Lighter and easier to customize; can go up faster if you are experienced
Learning curve, time required for complex cuts
Work can be done off-site and set in place; solid and durable
Minus: Can be more expensive, difficult to do on-site for larger outdoor kitchens and complex jobs; cannot be DIY
Easier to install; lots of designs and pieces ready-made
Minus: Cost; still requires installation time