I had this true-length drawing from Popular Machanics and did a 'Template' comparison.
The Centurion is a reverse-half-body.There is very little empirical wind tunnel data for such forms,but the best I can guestimate,is that with everything faired in,she might see Cd 0.13.
Typically,the reversed-streamline body has 60%,to 100% more drag than when it's boat tail is 'following' instead of 'leading' (according to Eiffel and Fachsenfeld).
As a half-body,in ground proximity,and with wheels,the penalty looks to be perhaps only 30%.
So where the Centurion 'backwards' might yield Cd 0.10 with a perfect cleanup,as she sits,Cd 0.13 would be nothing to sneeze at.And her frontal area is remarkable.
