I recently started to work with the Kinetis devices, for my first project I used the K64 FRDM board, that was good to get familiar with the chip, tools, PE and KSDK.
For my second project I downloaded the BXL files and was able to import them into Altium. I created a basic board that I can use for multiple projects using the K26, the board has a USB port added, a couple of switches, LEDs and the debug connector, just a minimum setup. I used the schematics from the demo boards to check what I had included.
Agreed, it could have been easier if the minimum chip setup circuitry had been shown in a data sheet like it used to be, this would be good for an application note.