This is a modification of the terenceang design.
all other files will be from his project link https://www.printables.com/model/496074-creality-k1-riser

Only 4 screws are required as shown in the image. filament sensor screws will use the original ones

Edit: no need to extend the filament sensor cable. Just rearrange the cable and it reaches the new location without any problems

3 walls
10% fill