Having read the Diary of Petr Ginz, and been to many of the the places he records, see Heydrich Assassination here, this is to suggest another viewpoint. I have not yet read HHHhH, but suggest another perspective to this historical documentation angle for adults.
- Build on the theater work about his life, http://www.radio.cz/en/section/books/petr-ginz-a-moving-dramatization-of-a-wartime-diary
- Tell the story in film as part of the WWII perspective of an actual child in Prague at the time. See a review of the diary at http://www.nytimes.com/2007/04/10/books/10ginz.html. He knew of the assassination and the reprisals. He wrote of them in his diary, however matter-of-fact. Or re-release Operation Daybreak, even remake it, with Petr Ginz included.
- The Orthodox Church of Sts. Cyril and Methodius is still there with its museum and story-telling exhibits. The map of safe houses, the equipment, all are available for an illustrated story or interactive program for young people to teach them about WWII.
Petr Ginz tours in Prague, for example, would not be difficult to put in pamphlet form for walkers.
Gripping, says Alan Riding, in the NYT review. How could this story not be gripping. Tell it, show it to the young.