The front horizontal part looks rather flimsy. Would it stand up to a torrent of full-body blows from my hammer? Or my rubber mallet? Where are the vises?
Well, the angle supports do not look all that strong, but if the majority of its area was supported by the underlying desk structure then I imagine it might be quite sturdy indeed.
Something to think about, and perhaps plan for in one’s next workbench project I believe.