After testing is complete it is required to finalize the design. The final design should be presented by a combination of a drawing(s) and text. A description is included in a design report as well notes are often used on drawings to describe features which are not readily apparent on the drawings.
A description of how the product is used and by whom should be included. Again this may be done using a combination of text, drawings, or other figures such as photographs. Text may be place on drawings in the form of notes. Drawings and figures should be referred to from text in the design report.
Details of the design should be presented. This includes
Of course the best final designs will be realistic (possible) and marketable. If your idea was further developed, would it sell ? Remember your idea needs a lot of financial backing, marketing (getting the design to where it can sell and creating customers that know they want your design and know where they can purchase it), and manufacturing. All of these operations require a great effort. Only the best ideas generally turn into reality.