Years ago there was a thriving aftermarket for sunroofs but these were generally cheaply made and poorly installed which gave them a bad reputation. There are a few aftermarket sunroof retailers remaining but with most cars/suvs now have unibody construction, adding a sunroof will almost certainly reduce the rigidity of the structure and have negative consequences on handling as well as squeaks/rattles, etc. I can't help but think that it will reduce the value of the vehicle.
Definitely not advisable. These aren't 60's era American muscle cars that you could take a cutting torch to and not impact the structural integrity. Even if it does work, and doesn't leak or cause other problems, it will kill your resale value.
You will damage the structure of your vehicle and it will become very unsafe if you have an accident. The only reason to do this is if you are going to use your GLA as a show car and not a daily driver. Other areas of cars equip with sunroofs are fortified by the manufacturer. Just like convertible cars.
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