I was looking at the Z today and thinking about it, a targa top would be nice, but may to to difficult to do. TTops I think would work pretty well. The hardest part would be the sheet metal work, and the gaskets. You'd have to custom do a new headliner and maybe move the little antenna for the touring models, But all in all I think it would be totally possible for around $6k at the highest. I don't think it would cost more than that.
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