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. Learn how to build yourself a boat in your backyard. our complete boat plans collection is available for free and immediate download. it is the largest wood boat. Free motorboat plans for the backyard home builder, build your own speed boat, cabin cruiser, runabout or utility boat using these simple plywood designs..