The way you described the resistor box wiring is right, wire it in where ever you want, I wired mine in closet to the injectors, i just ran long wires and mounted the box where the factory battery tray is, since my battery is in the trunk.
I dont have a vacuum diagram but it should be with the 8g service manual here on the site.
Your downpipe design will largely be influenced by your choice of turbo and manifold. I will tell you this, if your using a DSM manifold and T3/4 adaptor, the bend is wicked. I cant even remember the radius, I wanna say its the tightest 180 bend they make aside from the donut bends. Again, the design and bend radius will depend on your manifold/turbo and also the desired size of the downpipe tubing.
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