One issue I see is that the peripherals are almost certainly going to be short lived. After building and enjoying, they'll take up a lot of storage space yet also not likely be something you break out frequently. Thus they'll likely hang around a while before going into the recycling. If you think of how much time things like Move idled in many people's drawers and cupboards, and each of these constructs has far less usability than one of those peripherals (how many games are going to require the Piano controller?), it strikes me as an intrinsically disposable concept. Perhaps that's part of the intention to make them from cardboard, knowing they'll be short lived?