Very good, much respect due for attempting to use the proper engine in the final incarnation despite the difficulties. If you need any in depth engine technical assistance with respect to the centuarus do let me know, companies all over the world invite me to talk to their engineers about warbird engines on a regular basis.
Some data on historical developments is also available at the National Archives at Kew. Just type "Centaurus" into the search box. If you cannot visit yourself
I know people to take photos for you which will be cheaper than using the copy services.
Discovery | The National Archives
All the best !