About this 3D model

Not the most exciting model... So I had a problem... I printed out the 4x lego mini fig: http://www.thingiverse.com/thing:5232 And a 4x Darth Vader: http://www.thingiverse.com/thing:4222 But the Vader helmet is duplo, while the lego minifig, is well, minifig... SO I made an adapter.