Yes that Schumacher car is a SPC what means Saddle Pack Car.
But the original C-Car was released long before the Corally car so Schumacher was the inventor of that design. If you look at the very first PK Corally car what had stickpack battery and compare with the C-Car you will see the basic design and geometry is the same.
The interesting thing is there was another car what did not only look but also had some Schumacher parts this is the TRC Pro12. Ever wondered why an American car had some metric screws between all the other inch screws?
Actually the TRC looks like a Delta Spyder with t-bar and rear pod from the British C-Car and indeed the pod is original C-Car parts.