Jim,
As you know, as a Trustee of our Regimental museum, we needed a Charlie G for a display, and would you believe there wasn't one deac available through the usual MOD unit, so I decided to make one, and a spare for me as in the picture.
I bought oddments for them both, such as the telescopic sight, and handles and covers and Bob's your uncle. The Venturi doesn't open but someone with a decent cutting saw could achieve it easily, to accept the drill round!!![]()