Hello Doug.
This is my first post on here so please forgive me if I say some thing wrong. This is a very rare beast, there where very few Dorchesters built, and I think only one or possibly two survive in museums. It is interesting as the cab is not of the armoured pattern, but is more like a standard matador cab that has been mounted on the front of the internal armoured bulk head. I have a copy of the Stowage Diagram which may help with the interior layout in the Armoured command Vehicle role. if this would be of help drop me an email.
Cheers
Ian