The left system is constructed the same as the right except that the bend which angles the exhaust inwards and down is a 60 degree angle rather than 45 as the cylinders on this side of the engine are further to the rear of the engine. For final assembly I'll use a jointing paste on the overlap joints.
With the exhaust complete, I used the extra time today to cut out the oil filler door flap from the upper cowl. The removed section was riveted to a section of hinge and this and some stainless steel strip was riveted to the cowl to mount the door and provide a lip for it to sit on. A hole was then drilled through the door and the strip and a catch installed. I still need to fibreglass the strips onto the cowl to provide extra support and get rid of any gaps.