A Woodworking Plan and Instructions to Build a Happy Days Highchair This is our product offering of woodworking plans and instructions to build the project shown above. We do not sell the actual pre-built product or wood kit. WOOD AND HARDWARE NOT INCLUDED. Our No.31 series woodworking plan is proudly designed and made in the USA. Rated for intermediate carpenters, woodworkers and craftspeople. Questions? Please email us at sales@woodworkersworkshop.com before you buy. We're here to help!