The Erich Konzept I is a blueprint design from 1965 that was developed as part of the T/KPZ 70 project. The developers wanted to create a turret with a spherical base that would enable it to rotate on three axes. They also planned to mount a 120 mm cannon that would be stabilized on three axes and explored the possibility of equipping the vehicle with a more powerful gun. The project went no further than blueprints.