This looks great but probably not something I would do. I would be worried the top would make noises or leak over time. Corvettes have a noise issue with the factory targa tops.
But if you are interested in giving it a try. Check out the Mitsubishi Eclipse boards. I know a bunch of 3rd gen eclipse guys did this. They welded frame support bars under the car to give it more rigidity. I think they used the convertible's stiffer frame as a template.
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Slightly modded
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