People who use Wheel Chairs , always face difficulty using escalators. Students at Illinois Institute of technology find solution of this problem by designing this chair in different way. Wheel Chair developed by them can be used at escalators.
Mini Scooter is good and practical project for mechanical students. Moreover, it can be build using the materials which are available easily.
By building scooter , you will understand the how it works and also what are the difficulties engineers face while building two wheeler. I would suggest you to go one step further by building it green. Green means scooter which runs on compress air or solar or any form of energy which is less polluting then existing one.
While building this project , I would suggest you to focus only on its functioning and less on looks or its design malfunctions. Because designing is altogether different field , it needs different approach and time which we can do later after building our mini scooter.
Things to consider:
Estimate cost and a profit feasibility
It should be light Weight
Safe to ride