It’s definitely been done before.

The closest to this design off the top of my head would be the Lockhead XFV (1954): https://en.wikipedia.org/wiki/Lockheed_XFV

The idea of a VTOL tailsitter, but without the single primary planar wing surface, goes much further back. The Nazis were in the process of building the Triebflügel at the end of WW2: https://en.wikipedia.org/wiki/Focke-Wulf_Triebflügel