Lets create the PineCom

[EternityForest]

But then, what would it do that a phone doesn't?  That was my point.  Everything suggested here seems like it should work just fine on the PinePhone with some kind of attachment, at most.  This is the nice thing about "smartphones".  They're universal computers.

Perhaps we should be looking at a "ComCase" instead, that includes the ultra extended batteries, and the sensor expansion slots.

But the expansion connector only has I2C, and it would be hard to create a robust mechanical attachment using USB, without adding a lot of bulk, or using bluetooth, which isn't idea.

For me, the make or break point is really the mechanical attachment method.   That's what makes the difference between a nice device you want to use, and an award contraption with two separate units that nobody wants to actually deal with in the field or even on the workbench.