I do track weekends, so I wanted something that would be at least as safe as the factory non-sunroof car would be in a roll over event. Fiber glass (esp my DIY skills with that material) didn't fit that bill, but a decently thick sheet of steel at Lowes did once I went a little heavy on the rivet count.
The roof IS curved, and the sheet IS flat, so there will be some humps along the edges that need to be filled with RTV. I riveted it from the center front and finished it at the back to place those humps where they would bother me the least. I also found I needed to cover the tops of the rivet heads to stop all the leaks. Used about half a tube of black RTV in a caulk gun to do it.
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