Plough Book Sales sell copies of the operating manuals for the Blaxland Chapman engines, I have copies myself somewhere if you don't have any luck. As for cylinders I hope the last reply helps you to locate some as most old small marine engines have suffered the same fate with water jackets rusted solid frozen and broken away, so finding good used ones that aren't part of a good engine would be very unlikely I'd think. If the cylinder itself is ok, then the outer jacket can sometimes be repaired adequately for a static display or running without any load as cooling flow will be poor.