I think it would look totally bad if you painted the tank all rust brown, and maybe painted some eagle feathers on it flowing back. I think it would fit your theme and be a really cool accent
I finally got around to bracing the rear fender, the front had no place to mount it as there was a pipe in the way so I needed a bracket. I kept my eyes out a few days looking for the right pieces as I didnt want just an l shaped plain bracket and today I picked up this old steel bike plate and hmmmmm that will work!