Custom Wood bed

[plowro8]

Question about wood beds. I am a carpenter and built a custom walnut dash for my 72, along with walnut veneer on the glove box, radio delete, ashtray and instrument cluster. Wondering if anyone knows how hard it would be to make custom wood slats for the truck bed. Looking at pictures in Classic magazines and it looks like there are specific engineered grooves routered into the edges of the boards. Anyone have any experience with crafting your own? I would purchase the stainless bed strips from a supplier. Thanks