elf..
I think you want to have a ride that is made by you in your spare time..
It should be topless,the work quality has to the best available,..And in the end you want it to run on road with RTO permission??
Is there anything I got wrong??
If yes please answer where and why ??
Ok I have something for you that you missed or forgot..
Its a post by a4_attitiude.. here:-
http://www.team-bhp.com/forum/modifi...s-here-21.html (Swift Mods : Post all queries / pics of Swift Modifications here.) 
In the post it was said to be availaible at Vitese's showroom and they are selling it for 10 laks..
Now they can sell it only if they have RTO permission...
so you can get in touch with them for RTO formalities..
I think your project will get you the satisfaction you are looking for..
Do we get to ride in it???
Also After completing this project you should start one for an automatic roof....