Also, go follow timhaugan on Instagram and check his pictures. He owns the car AMD is building and has posted some pics of the turbos bolted up. Not a lot of details, but you can get an idea of what they are doing. You can also follow fastaudi, that's the account for AMD.

Finally, you can search rs246.com for info as well. They are focused on cars across the pond, but they have done some interesting builds.

I have yet to find anywhere that has a good, comprehensive description of a big-turbo RS6 build, but with some research, you can piece together a lot of info. If you decide to go down that path, you can be the first!