During the 2021 Annual Gathering of the Traditionsverband, Col W.Posch presented the history of Austrian tank development, starting from the war-time Steyr "Raupenschlepper Ost" via the Hacker Motormuli and the first APC prototype developed by Saurer, and ending with the final manufacuring model of the Austrian APC built by Steyr.
Here's the video: https://www.youtube.com/watch?v=8e6yxUkCD04 (Video in German)