Corbels don't really fit all looks. Me personally concrete is more of a contemporary or rustic so corbels don't really fit especially with a 6" overhang. I personally think you could get away with 6" without additional support with a good adhesive like above or a good silicone. If you really want additional support you can notch your sheet rock at two studs with a steel angle secured to the stud and just float over it with mud and tape and not have to pull the top.
Good job on the DIY!
Good job on the DIY!
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