This is the cockpit of the DHC-2ZB Twin Beaver prototype hand built by Martin Zwillingsbiber. The cockpit of a Zwillingsbiber Twin Beaver is much the same as any single Beaver, save for the dual throttle, propeller pitch and mixture controls in the centre of the control panel. A detailed story will be published in the "Canadian Aviation Blog" soon.
Canadian Aviation Blog
Photo Source: Neil Aird