Camera Lucida - How helpful were the instructions?

Tim Hunkin’s instructions on how to make a camera lucida appear to be easy to follow due to the pictures and the text accompanying them. However, the set of instructions turns out to be rather confusing when examined more closely. Firstly, the instructions given are incomplete. For example, the instructions mention a hole to look through although said hole was never mentioned before. Similarly, the installation of the reflecting plastic plate is missing. The author probably left these steps out purposely as they seemed obvious to him. To someone who has never  built a camera lucida before, however, these steps are essential. It would also have been more helpful to number the steps, even if the text is very short. Another confusing aspect that the reader constantly has to jump between the text and the pictures. Neither text nor pictures are sufficient on their own to explain how the camera is built without causing utter confusion. Overall, the text itself is not badly written. It is concise and understandable, but the fact that it is only partially complete makes the instructions rather difficult to follow.