I noticed that you have begun creating links to new image files for the illustration of Rumble's Systems Model of ODL and for the Sample Answers to the exercises. However, these links are not yet active. I'd love to see your work and to find out how you went about it.
In the version of this unit that I have been working on, I created the Sample Answers as separate pages, using the Tables template, see CFOS_Table_1.1. I need to edit some of the answers in Table 1.2, so the table option might be a better way to go.
I also notice that you have changed the numbering of the exercises. Although the exercises are linked, I found the compound numbering a bit confusing. Do we even need the numbers at all?