I plan to build a floating desk with the following dimensions: 75"-79" long and 22"-24" deep. I plan to mount it to concrete wall(see Image). My Preferred material is MDF.
The desk intended for use as computer desk and writing-reading desk. The load on the desk will be mainly consists of: monitor screen, books, laptop and so on.
My goal is to create a strong and stable desk that can support not only the load described above, but also beyond that(specifically: adult leaning on the desk with his arms).
My question is: How can I support the desk without any legs or bracket?
EDIT: There is a similar question to my question on the site(HERE) but I think the solution proposed does not fit my question. Since to my opinion the proposed support in solution is too weak for my purposes. I'm pretty sure that if I will lean down on the edge of the desk with time not only it will created a 'belly' but it will damage the Alum angle stability (maximum torque). I think the proposed solution is better suited for shelf that functions as a desk, and I want a strong desk that can support for example a person sitting over it.
Note: I do not care if the most of the entire thickness of the desk(based on the design offered) would be a hollow, as long as it's does not exceed 5''.