"Saj555" I like the way your mind works lekin, why don't you explore the idea of a kit car like look @ Gazelle Mercedes kit car this is also a convertible and I know some people who have built this on top of a VW chassis.One guy here on Pakwheels converted a Mazda 808 (if my memory serves me right) into a convertible talk to him and see what problems he faced with the structure.
We need more people like to think of doing the impossible only then will we move forward as a nation. Ho sub kuch sakta hai you only need Motivation, Commitment and ideas, Talk to another guy leepu and watch his show "Bangla Bangers" for motivation, in one of his earlier shows he converted a Toyota Trecel into a good looking "sports car" so "don't" let the thought and the fire die in you if you have thought of something like this to me this proves 2 points
- You think OUT OF the box - Which is good
- If you can think it you can do it
I am not saying it is going to be easy but it is doable try with a Corolla or something where parts and expertise are available
Hope this helped you .............. BEST OF LUCK