Vehicle chassis design is the first step and done through catia or

Lotus and stability and structural analysis are done

drive and drive system is selected based on the vehicles weight, ergonomics and supply source. For this purpose torque calculations are done to select the required rating of the drive. It also includes design of speed controller for the drive 

Based on the drive rating accumlators and solar pannel ratings are selected and the setup is designed in such a way that it attains maximum efficiency.

this includes the various safety features installed, their sensor ratings, microcontoller programming.

this is where the base clearance, aerodynamics, turning radius comes into play

this is the most important step and aerodynamics, stability, center of gravity of the vehicle must not be compromised

a suitable charge controller is designed and fabricated based on solar panel rating and accumlator rating

the materials are fabricated based on design

whole setup is build into the prototype

on road testing of vehicle is done