Thanks people. The main body was an aluminium tube that I cut to shape with a hacksaw and then spent ages polishing with metal polish. The grips are plastic 'L' section glued back to back. The band around the middle was just aluminium sheet. The little detail on the side box was a crocodile clip cut up. The upright pieces on the tip were made from the clip of an ID badge. The knobs were bits I had from various old electrical gadgets. I had a very old projector lens with a chrome surround that looked right as the beam emitter. The back plate was an old metal lid off a slide film tub. I don't think I bought anything at all specifically to make this.