The biggest problems I keep running into is warbling due to paper thickness, I need a metal rigidness, yet lightweight. Also, the matching up of parts has micro errors turn into huge problems as much as being able to be seen easily as not matching up. So far, cutting up the pieces into sections may solve that thru trimming the pieces so they line up. So now I'm back to printing sections up, I may have to use black foam board as an inner support of the model, a slightly smaller built-up model, and then glue the image of the paper model over it. At this point, I really don't know yet.