Mount the printed parts like shown in one of the pics to the Skadis board - I recomend all four corners, then put some adhesive tape on the base part (I use Tesa Powerbond) and press it against the door.
The 36x56cm Skadis fits perfectly on a Besta door.
For Billy I cut one in half. If so, you need four additional screws: M4x14 - use the provided cap for them.
The author marked this model as their own original creation.