I am unaware of the 17 pdr (76.2 mm) evrr being installed in a Churchill. 75 mm of signoficantly less power were the usual for latter msrks. However, a fine model, thank you.
I don’t know much about models but I have much (22 yrs) of service. The aging and wear on your model is absolutely convincing and just like the Chieftains and Challengers I served on looked after operations. Well done!