There's a guy that makes scale props and hubs, if you want his phone number I can look it up in my build. I am running my build on RCScalebuilder.com. He does a great job on the props, even the markings but they are pricey, around $450 for a set of 4. They are 16.5x14 3 blade approx, his are exact scale size. The gas engines can turn the big props that look good. Graupner makes a 3 blade that has a simular blade shape to the scale and they are a lot less that $450.

Good luck with the build, I am amazed at the Wingspan models. I wish Michael offered them back when I started my DS B17.