I modified this topic to be more Useful,
Mr. Stanislaw Sobkow also designed the WS-2,it was two-seat low-wing sporting
monoplane Project of 1939,the war prevented any progress of those designs.
After the WWII,he constructed WS-3 & WS-4.
http://www.samolotypolskie.pl/samoloty/2717/86/Sobkow-samolot2