Pictures:
View: https://imgur.com/gallery/alienware-aurora-r3-restoration-0NlrMb4
In the pictures, you'll see I have the GPUs connected, but the other end of the cable does not fit into PWR2. So, the gpu cable has to change.
For the PSU, I searched "CN-0FPWDW-47985 Power supply" and got 305W...