I am interested in the Jetson TX2, but it is unclear to me whether the embedded module is meant only to be used as is and only a carrier board is meant to be designed and customized or if the GPU and ARM CPU combination can be pulled off and embedded into a custom PCB as a single device that combines the carrier and CPU/GPU.
It is a module where many parts (including the SoC, WiFi, RAM, and eMMC are permanently part of the module). The module can be used with a number of carrier boards. You would build a custom carrier board (lots of information is available to do that).