I am putting a new countertop in (Lustrastone, is like Durastone) that will wrap around an outcorner wall. Along one side is a 48" wide base cabinet and the countertop will be 38" deep. It will extend 18" beyond the left side of the base cabinet and wrap around an outcorner wall that is not as strong as a regular wall because it has a pocket door in it. That part of the countertop will run 40" along the wall and will be 18" deep. The full length of that will actually be the 40" along the wall + the 38" deep. I am planning to use hidden countertop support along the front of the base cabinet. I am trying to figure out how to support the countertop along the wall and side of the base cabinet without depending on the wall to bear the weight. I would like to stay away from a leg support on the outer corner of the countertop. I am thinking about using hammered steel tubing that is 2" X 1". Here is what I have in mind:
Run the tubing horizontally along the wall (the cabinet does not reach the corner....it is about 1 1/2" from the corner....... I will have to run the tubing along the side of the cabinet also)
Place a piece of tubing against the wall from the floor to the bottom of the horizontal tubing, acting as a leg, where each cast iron or wrought iron corbel will be
Attach the corbels to the horizontal tubing and vertical tubing (the corbels will not necessarily be where there are studs in the wall)
The countertop will sit on 1" tubing as it will be placed flat on the wall. I am not sure how deep or high the corbels need to be. The Lustrastone will be formed with plywood under it.
Will my idea work? Will the tubing be strong enough?