Outdoor Wooden Bench with Concrete Base Plans DIY Park Bench Seat Build Your Own. Outdoor Wooden Bench With Concrete Base Plans DIY. Park Bench Seat Plans DIY. These plans will show you how to build your own Concrete and Wood park bench. I will mail you hard copies on 8 1/2 X 11 paper. All plans are designed or reviewed by Ben Stone. Ben is a retired Engineer in Canada. Ben also drafts these himself using the latest AutoCAD software to ensure accuracy. He studied Engineering back in the early 1980s. After over 30 years in the Construction industry he developed a passion for building cool items around his farm and cabin. These are great DIY projects. With a little skill anybody can Do It Yourself. Ben is always a email away if you have any questions while building one of his projects. He is adding new plans all the time.