How to build hydroponics gardening systems is one of those questions that boggles the mind, often leaving the person asking the question wishing he or she hadn’t even mentioned it.how to build a greenhouse How to build hydroponics gardening systems depends upon the size of the space available for the garden. Whether the system will be located indoors or out. The skill level of the gardener. The types of plants to be grown. Lots of things come into play when designing and building such a system. How to build hydroponics gardening systems successfully, especially when there are plants requiring different growing conditions, involves clustering similar plants together.