Can my work on manufacturing, designing & fabrication of an electric solar vehicle be considered as an original research & can it be published
The simple answers to your questions are that, yes, you can claim your work to be original research and you can have as many authors as you like.  That said, the fact you think your work is original and of publication quality does not guarantee that any journal will agree.  Your best bet is to discuss the specifics of your project with your advisor (I assume you have one?) and follow his/her advice.