Assembly of the first vehicle began at the Nibelungenwerk plant at St. Valentin on February 16, 1943.
The plans had been accomplished by Altmärkische Kettenwerke (ALKETT) in Berlin.
The hull armor was originally welded together by Krupp in Essen for the Tiger (P).
After Tiger (P) production was canceled, the hulls were reworked for the new automotive layout at Eisenwerke Oberdonau in Linz, Austria.
The superstructures were welded together by Krupp in Essen.

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Source :
Thomas L.Jentz, Museum Ordnance Special Number 4, “Elefant Panzerjäger Tiger (P)”, Darlington Prod., 1995

As with most of the 8.8 cm tank and anti-tank guns, the gun tube with breech was produced by Dortmund Hoerder Hutten Verein in Werk Lippstadt. Assembly of the 8.8cm Pak 43/2 in its mount was performed by Krupp.
The Maybach HL 120 TRM motors were manufactured at the Maybach plant in Friedrichshafen.
The electric generators and motors were fabricated by Siemens-Schuckert in Berlin.
All of these component parts were shipped for final assembly to the Nibelungenwerk in St.Valentin, Austria.

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Source :
Thomas L.Jentz, Museum Ordnance Special Number 4, “Elefant Panzerjäger Tiger (P)”, Darlington Prod., 1995

At first, Nibelungenwerk was only contracted in November 1942 to assemble the chassis and Alkett was to assemble the superstructures, but in February 1943 the decision was made to have all assembly work completed at Nibelungenwerk. Alkett was still responsible for completion of two trial vehicles (Fgst.Nr. 150010 and 150011) for which Nibelungenwerk had completed the chassis. Nibelungenwerk assembled all the rest of the 89 Ferdinand (Fgst.Nr. 150012 to 150100) in operational order in April and May 1943.

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Source :
Thomas L.Jentz, Panzer Tracts No.9, “Jagdpanzer”, Darlington Prod., 1997

Visits at Nibelungenwerk

Hitler : June 20,1942
Speer : August 27,1942
Speer : March 30,1943
Hitler, Speer, Guderian : April 04, 1943
Göring : April 15, 1943
Guderian : May 25, 1943

On May 8, 1943, the last Ferdinand Fgst.Nr.150 100, later serving with the 4^th Platoon, 2^nd Company, l/656(653^rd) Abteilung(Battalion), was finally ready, and the Nibelungenwerke crew celebrated it by covering the hull with chalked graffiti to mark the occasion. The vehicle was also decorated with branches and dummy artillery rounds.