I based them on the pallets from Terrain Tutor's tutorial, but I changed them slightly to better match the pallets that I see around town. I used a pin vice drill and some wire to add "nails" to one of them for the added realism, but that was a huge pain, so I probably won't do that to any others going forward. They are super easy to make if you don't add the nails, only taking about 15 minutes a pop.