Thanks chaps.
In designing the Vigilante, it was important that I tried to keep the Vickers-Armstrongs Valentine heritage alive whilst completely changing their iconic infantry tank into an effective cruiser. With the suspension changing completely, the instantly recognisable engine deck was a must for keeping as was the general shape of the Valentine’s straight sided turret. Of course, the Vigilante’s turret, with its QF 75mm/QF 6pdr Mk V and 3-man gun crew, needed to be much larger.
As a final plug for CAD and 3D printers, I openly admit that this build would never have happened had I not been able to design the shapes I needed (albeit within the frustrating, edge of my pants limitations of Tinkercad) and print the results. My whiffing world has become a much larger place!