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  Assuming your two-story wall is 20 meters long and you decide to grow potatoes.  Let's grow the potatoes on one side of the stretcher design. By growing plants 20 cm apart and stacking the stretchers with 20 cm vertical separation you can grow 3,500 plants. If one plant produces 2 kg the total harvest would be 7000 Kg.  Since potatoes can be harvested within 70 -80 days you'll mange to repeat the growing cycle 4 times in one year. This means your annual produce will be 28,000 Kg.  Using the 50 cents per Kg average, your annual gross income will be $14,000.  Let's spend $4,000 on seeds, labor, water and fertilizer. You are left with $10,000 to pay in mortgage. This is not taking into account your one time investment in growing equipment which can be $7,000-10,000.

Please Note:

Before you chose a design you need to make choices about container sizes and the way you desire to provide the plants with nutritional liquid.  Your choices will have to take into consideration the kind of plants you will grow, the available space for growing, plants' maximum exposure to sun and what is convenient for you.

Using Kratky Hydroponics a head of lettuce requires 4-5 liters of water from seedling transplant to harvest.  Herb plants and most leafy greens use similar amounts.  A cucumber plant uses 200 liters or more while tomato plant uses 250 -300 Liters.  Using large enough containers saves you the effort of adding water.  With large containers you need not use water supply pipes or float valves.  But large containers use larger space and too heavy to move around.  You decide the container size based on what you grow and the way you desire to control it.  For more than few containers   float valve use may be necessary

You can modify any of the introduced designs or methods to suit the plants you like to grow, to fit in the space you have and to incorporate your own creativity.  These methods are by no means the only methods.  The designs you see here are meant to stimulate your thoughts and to help you apply your own genius.  

For additional information please consult the ample literature and videos you can find on You tube and the Internet.  Search for Vertical Aeroponics,  Kratky Method or Non-Circulating Hydroponics