If you are asking, most likely you will not be able to hack it.
The connectors are most likely different as well as the hinge design. That's not even taking into account the graphics card and the wiring schematics to the retina. (Who knows if the wiring schematics are different from the macbook pro). Another would be the availability to getting your hands on the entire back section.
If you are willing to experiment and am willing to spend as much money as it costs to get a retina MBR, then it may be worth it. But i doubt it's worth it to those unless they are enthusiasts willing to change on the engineering challenge involved in hacking it together.