Building Transmission

Hey guys, So I was wondering if anyone built the 6AT from a 335xi. I have a 2012 335xi auto which I am planning on building but Im just trying to cover all the basis before I fully dive into building it. I have tried to do some research and I found that people build the 6AT on the 335i not sure if we have the same trans? anyways I was wondering if anyone has any experience with building the transmission or running alot of power through them.



Thanks,