physically challenged person

hai! I am a physically challenged person. At present am having a 2 wheeler thats converted to suit for me to drive. I would appreciate if it can b clarified on the following. (i)If the Maruthi Car could be converted to fully Hand driven car, that would enable to me to drive by muself; (ii) What concession that Maruthi or its Dealoer gives for a physically challenged person on the purchase of the car; and (iii) What is the procedure for me to drive it legally with a Driving Licence for being on the roads without any hazzle. Am based in tamilnadu and guidance on any contact preferabbly here would be of Great Timely Help…! So please direct me at the earliest pls….!