Hi Bastien, I hope you're doing well!
I'm really sorry for the inconveniences this may cause, but the only Design and Layout files we provide at the moment are the ones found in the FRDM-KW41Z's product page.
Please let me know if you need any other information.
The available file format for Layout files included in the design files is the layout .brd file included in the LAY-29102_C1.zip directory of the KW41Z's Design Files Archive:
I'm really sorry for the inconveniences this may cause.