after reviewing more sources........ still gonna say your book is wrong lusche.......... WW was indeed built with a hand crank...... as your picture clearly shows..... as all pictures show......... but it also had a drive motor place on the lower left front of the frame which drove the turret........ the handcrank was there for motor failure.....
The Wirbel is based on which Panzer hull?
Did the Panzer in question have a powered turret? Very probably yes.
So, why take it out of the Wirbel? Maybe a supply issue, but the only engineering reasons would be space and weight. The WW turret seems like it would be lighter and have less angular momentum issues. Space seems more of a possibility, but a big gun panzer would have space restrictions, also.
Anyway, that HTC works to this level of detail is commendable.