I love this idea! Generally our AP courses give 5 chapters as a summer assignment so I will probably do the same, and maybe submit an outline of the chapters, but the idea of an artifact is nicely relevant to this course. I haven't looked at Blown to Bits yet, so I'll have to see how the chapters flow.
Do your students coming in have any coding background? I was thinking of maybe assigning a self-taught coding activity like the Accelerated 20-Hour course for any students who have not taken a programing elective.