You will be amazed how sometimes a totally unexpected picture or pattern begins to emerge from either a graph or chart. It should be neat but functional, you are not expected to produce a manufacturers' working model because it most likely is a science project for a kid. Make it fun, but be absolutely sure other people can understand what you did. Above all show that you used the scientific method. Be sure to include a page that shows where you gathered all your background information.
Any decent presentation includes some pictorial presentation to convey ideas.
When you look at my crystal set page you will see a schematic diagram. Because this is a pictorial plan on how it is to be constructed - a bit like plans for a house. I have seven now grown up children and 14 grand-children. However in every one of those cases I have been able to exercise a very close supervisory role which I can't do in your case. Accordingly I have had to cut back my list quite drastically for reasons of safety.