Does your car have a convertible top still? If it does, mounting the frame of the top 2" higher may cause some issues.
If you are fabricating stuff, why not just make your own version of roll bar extension like the BK bar or your own 4 point bar?
I don't know much regarding structure at the moment, but I did notice that the bolt-in cage in one of my Boxsters is bolted through the structure of the car to heavy plates underneath.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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