DIY Picnic Table with Built-in Cooler ~ What can make a DIY picnic table even more delightful? A built-in tabletop cooler bin with a replaceable cover. The plans here are for a 6-foot-long table. At the bottom of this tutorial you’ll find a link to a downloadable and printable version of the instructions. Just follow these step-by-step instructions to build your own picnic table with a built-in cooler.