The ability to build one is probably not a limitation. But by your own examples, a 3/4 scale is/has been used is most those cases. So it begs the question: Why pay for 1:1 when you van get away with 3/4 scale. With the countless number of people who have seen these, I bet easily 90%+ had no idea is was not 3/4 scale. I had no idea at the time when I posed with it. I was impressed with seeing it and it did not occur to me to try to envision if it was true to 1:1 scale. And I am a huge Star Wars fan with a interest in X-Wings. Now factor in the general population of people who see these. Kids, grown ups that don't know anything/very little/or don't care, the casual fan, or even hard core fans that do not have a high need/or understanding for such detail. What? Someone is not going to want to pose with it, visit an park or museum because it is undersized?