I'd love to build something like an Axis plane to fly, simply for the reasons that I'd love to give the guys with their Bearcats or Corsairs or Spitfires, something to chase.
I know that the Messerschmitts, while they were hated (and I mean, HATED by the Allied forces) during WWII, it was because they were, in a lot of respects, engineering marvels when compared to what else they were up against.
My only problem with building a German plane is that there are a few...well, let's call them "old veterans", in my club. These are people who still have a negative view of the Germans, almost 75 years after WWII ended, and if they're there at the field, they make noise about flying one of the "enemy's" planes. Kinda sad.