[1] After Poland declared independence, Stanisław joined the 5th Zaslaw Uhlan Regiment, with which he took part in the relief of Lviv and the fights against the Ukrainians near Kovel.

During the Polish–Soviet War, Panczakiewicz was already a cadet officer and deputy commander of a motor column at the disposal of the 5th Army of under General Władysław Sikorski.

[2] In 1927, Panczakiewicz started working at the Central Automotive Workshops (CWS), immediately as the head of the body shop, as its youngest employee.

[1] After the outbreak of World War II, during the Invasion of Poland, he was evacuated with the crew and resources of PZInż to the eastern areas of the country.

After a short period of work in state institutions, at the beginning of 1947 he took up the position of head of the bodywork department at the Central Technical Bureau of the Automotive Industry (CBTPM), later renamed Centralne Biuro Konstrukcyjne No.

From 1950, the Sanok Wagon Factory "Sanowag" also assembled a Fiat 666RN bus[10] based on an Italian frame and engine, with a body produced on site.

This resulted from a conflict within the team between Panczakiewicz, who had extensive pre-war experience in metal and wood structures, and a young engineer from FSO - Stanisław Łukaszewicz, versed in the design of the Warsaw car, calling for an all-metal body.

The so-called Syrena II prepared in 1954 by Łukaszewicz used body elements from Warsaw and was technologically developed for large-scale production.

Panczakiewicz's competing car had a body based on a wooden frame, covered with fiberboard panels and used fewer components from Warsaw, but was stylistically better.

Pionnier reconciled engineers of two generations by choosing Panczakiewicz's styling and commissioning Łukaszewicz to develop its design using more modern technology.

[1] He presented drawings of two of his own proposals for modernizing car bodies, in opposition to those by the Italian company Carrozzeria Ghia.