Place the skids on the gravel parallel to each other and the ends line up. begin with the skid on the low side if sloped. level the skid by adding or removing gravel along its length. level the next skid using a plank placed perpendicular from the leveled one to the non-leveled skid. ensure the skids are level lengthwise and with each other.. Here are 26 genius diy pallet shed, barn and cabin plans and ideas to show you how to make a building out of pallets for free. these plans are step by step and easy to follow. includes pictures..