werkspoor worked as a subcontractor for fokker in the late 1930s. by february 1939 500 of the 2,000 employees working for fokker were working at the werkspoor location zuilen. these were woodworkers, that had been moved because there was not enough room for them in the rapidly expanding fokker factory in amsterdam. the wings of the fokker fokker g.i, first flight 1937, were made of wood. the wings of the first g.i. were not built in zuilen. werkspoor did built wing parts for the fokker g.i.