Based on the construction and appearance, I would give this design a "C."   Note: These drawings do not address the write up portion of the project.
	This one is improved by making the cross tie lines bolder.
	Much better. The top side of the track stands out from the bottom. The ride is easier to visualize.
	Better yet. The top side of the track is one color while the bottom side is a color other than the support structures. Not only does the ride stand out but so does the track from the supports. For track design. I would give this an "A-."   To make it an "A+," the hills could be more parabolic for the free fall drops the track pieces could be made more smooth. A thin piece of wire could be taped to the underside of the track and shaped to give the track a smooth appearance.