I am gobsmacked at how awesome this box is, your son is sooo lucky!
I just saw Oodelally's Mario sprites which really made me want to play with perler beads, and after seeing your awesome box I have to say that my first project with them is going to be highly ambitious... read that as probably extremely stupid for a beginner ;P
Now I just have to find a dragon pattern that I can simplify into perler colours. Oh and of course the beads
One more time... AWESOME!!!