It depends a lot on where you get the models. Some people create the models just as a reference point for free-hand building with no thought to whether or not the model is suitable for unfolding and pepping. I mean theoretically these models could be unfolded as they are, a few pieces (especially the shotgun) would involve taping two or three sheets of paper together to get the length, and then just glue the individual components together and hope they hold up.