We have a very similiar setup. I never thought of mounting the exhaust like that. I like that alot. If you look at my build i have a really cool place to mount your compressor and tank. My compressors and tank are hidden. Peek at my build. Here is a pic or two. I modified the tank mounting brackets a bit. Fits nice and snug up there. And the compressors are behind it on the frame...
Just giving you some ideas. Dig the heck out of your rims and thanks again for the exhaust idea. ahah