[talsit]

Not really, you do the split according to functionality, not just a straight split. CPU/memory on one side, WiFi/BT/Baseband on the other.

[quantumhobbit]

So something like Google's project Aria that they just cancelled with separate modules for each function. Only not user serviceable.

[mikeash]

Like any phone. They all have separate components and boards connected with ribbon cables. You can see the iPhone 6+'s various ones here:

https://d3nevzfk7ii3be.cloudfront.net/igi/DSCkX6EfcARJYOHa.h...

The proposal is just to do a little more of that.