I would suggest tweaking some of the step descriptions. For example step 3. stores data in MiniDB and simulates storing in DB and step 8. Confirms success OR rollbacks/synchronises data in MinidDB's with valid data. This is too long but I just wanted to make a point.

BTW excellent book so far, I will consume it today. I have read all others available on market this one is the most promising.
+1 for reactive modal smilie