Before you try to have it installed, you need to check where the steel tubes (covered by the aluminium outer skin) are located.
I wanted to do the same, but when I removed the headlining, it was discovered that there seems to be an extra tube in the front half of the roof on my car, and it would be quite tricky to rebuilt the "cage", so I did not do it.
To keep the integrity of the body, you might need to weld extra tubes like a frame around the sunroof. Of course, you need to isolate the tubes from the skin to prevent furure catalyctic rorrosion.
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