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Originally Posted by Suislide
i'll give the same answer. just buy a Skyline, and get the roof professionally chopped off. it's easier, and probably cheaper then changing an entirely different car to look like it.
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You can't just chop off a roof, you need to make the body more solid. If you just chop off the roof, then the chassis will twist when you make sharp turns.
"The roof of a conventional car is essential to the stiffness of the chassis. The roof helps keep the car from twisting and bending. Building a car without a roof is a bit like building a suspension bridge without the cables. As such, the bottom part of the structure of a convertible has to be stiffened considerably. Heavy reinforcing brackets have to be added to the body of the car. This is why convertibles often weigh more than their fixed-roof counterparts.
If you were to cut the roof off of your car, you'd find that the body would twist a lot, especially if you were to do something like, say, drive diagonally over speed bumps. Eventually, the car would develop all sorts of squeaks and rattles and exhibit some poor handling characteristics. It's important for convertibles to have an especially sound structure to make up for the lack of a roof. "
source:
http://auto.howstuffworks.com/convertible1.htm
I guess a silvia convertible would be nice, but I don't like convertibles that much. They weigh a car down and aren't as aerodynamic as their fixed-roof counterparts. For daily drivin in the summer though by the beach it'd be tight.