That was initially my plan but with the costs involved with that I immediately ruled that out as I am just an IT systems administrator with no real training outside of making small models for 3d printing. I feel like the costs involved in making an entire transmission case half from scratch would be rather expensive even for me. If you are needing measurements of anything I can totally provide them for you just send me a PM or something. I have both the RS 6 speed and an AWD CVT with transfer case sitting in my garage. The one thing you will have to note is that the manual transmission used in the RS (RS6F52H) is completely different than the one used in the non-rs manual cars (RS6F94R). I was able to find a LSD that may actually mate to the Juke transfer case with no machine work needed but since I am not going that route I haven't dug into it too much.
I was able to find a transmission in Japan for less than $1000 but the big factor will be getting it shipped to the USA then the freight involved in shipping it to me. If I am right I won't need anything else from Japan or Europe but we will see if that is actually the case. We will see when I actually get my hands on the x-trail transmission though.