Note the classic barrelback transom just like the original boats of the past, and it’s easy to build using our plans especially intended for do-it-yourself builders. Chesapeake marine design offers a wide range of products and services in boat design and engineering including stock boat plans, custom yacht design services. Monaco. there is something about a classic mahogany runabout that attracts admiration and attention. the flaring concave sides flowing into a reverse barrel.