Boing Boing's Happy Mutant Mobile: the creation continues!

So there is. I interpreted that as only being accessible/visible when the van is set up for display, and I thought something that invited passers-by to interact even if the van is just parked and not set up would be fun, though I suppose there are potential down-sides to such a thing. The illustrated display rack is said to be behind the door—I think having it only in the window and making the window openable from the outside or open when the van is parked, or enlarging the window to show the whole thing (and perhaps some graphics welcoming passers-by to open/take) would be more inviting? Perhaps the passenger side and rear windows would be most effective for this (accessible while parked at a curb or in a stall) while using about the same total volume as one full side door.

This is going to be based on the wagon, with windows, not the van, with sheet metal window-substitute panels, right?