These are pictures of a mock up of the base of the buggy. It is made out of construction paper and doesn't represent the thickness of the card which will be used for the actual base nor the strength.
From this test it is apparent that wooden dowels might have to be used to strengthen the length of the main body as it is very susceptible to warping and bending. However this should be easy achieved by either running a piece of dowel along the length or having webbing across the width. It could be that neither of these will have to be used as the actual card that will be used is thicker and once the components are inside this might stop the body from twisting.
When trying to make the trolley wheel bracket it was found that clothes hanger wire is too stiff for the size needed and an alternative will have to be found.
The construction components:
Always a good idea to make rough prototypes to help formulate ideas before going for the final design. CAD has its uses but it also has serious limitations in comparison to physical testing.
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