Hi Joerg, if it were my truck I would definitely go with oak instead of pine for the box. If you can find white oak, go with that. It’s much harder than red and will outlast you. If you can’t find white oak, red oak would be my second choice. It isn’t hard to mill the bed planks to fit your wear strips. Just take one of the metal strips and hold it against a plank end to draw the profiles you need to cut so the wear strips lay a little proud of your bed planks.