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I have been redesigning my Burford-Kegresse to make it manageable for home FDM printing.
The Burford-Kegresse was an armoured half-tracked vehicle, used as a machine-gun carrier mounting a pair of .303 Vickers guns on a Scarf ring mount, as shown here, or as an unarmed personnel carrier.
It was in service with the British army from the mid to late 1920s, about the same time as the Birch Gun.
The British didn't use either half-tracks or self-propelled artillery again until WWII.
I've uploaded a couple of versions for 3d printing to wargaming3d.com:
The 1:100 (15mm) scale version (shown here) can be got at https://www.wargaming3d.com/product/burford-kegresse-15mm/ (https://www.wargaming3d.com/product/burford-kegresse-15mm/)
The 1:56 version for 28mm gaming is at https://www.wargaming3d.com/product/burford-kegresse-28mm-1-56/ (https://www.wargaming3d.com/product/burford-kegresse-28mm-1-56/) (Note: The 28mm version does not come with any crew figures).