Home / boat plans & kits catalog this directory includes all of the plans that are specifically designed for stitch and glue construction. power dory with. Welcome to spira international home-built boat plans. spira international offers a wide variety of 23′ offshore style pacific power dory; 15′ stitch and glue sea. How to build a boat from scratch? diy boat building plans – build a boat from scratch with these step by step guides.