Concept Tricycle

I know the model lacks many of the fine details and I am trying to add so. I made the model for my friend's 3rd year project. The idea was to model it on Solidworks but due to lack of time I made it on Blender. The tricycle was considered to be added much more parts. Hope that I can work on this model much further and also model it on solidworks soon. If you want to see the render image, it's on Behance:https://www.behance.net/gallery/98112061/Concept-Tricycle Also add your comments on missing parts and details that can be added.