I am looking for the actual dimensions of the Digispark. The base plate is 17.5mm x 19mm, but what about the USB Connector and what about the height? What's the bounding box of a Digispark with an additional shield on top (so I only have to add the height of components soldered at the shield)?
I think about putting a Digispark in a 2x2 DUPLO brick. There is at least room for 25mm x 25mm x 15mm without limiting the stacking properties of the brick, so height might be the limiting factor, depending on what is added to the Digispark.