I just did some research on the net and found a place called The samurai store. They also have an Ebay store. They sell Samurai armor.They're having a winter bargain sale of 10% - 50% off. The prices are about the same as the 1/4 Vader samuari. These are full scale wearable armor made in the traditional manner. They even carry a repro of armor from The Last Samurai. I'm seriously considering purchasing something from them in the future. They can customize the armor too. It might be worth exploring if someone wanted a Samurai vader. The helmet and mask would need to be built. I'm thinking of using a face cast I have of myself and sculpt the Menpo.
The mask alone would look really good in full size. Just different enough not to be noticable as a star wars piece at first. Always loved Japanese armour for it's artistic qualities, combined with star wars this would be a gorgeous piece to have.