About our free boat plans: the free boat plans listed here are public domain plans. we have put them together into a more usable format than most free boat plans. Learn how to build yourself a houseboat in your backyard. our complete boat plans collection is available for free and immediate download. it is the largest wood boat. Boat plans cabin cruiser: jayshil (keil kraft mermaid) cabin cruiser 2.4ghz rc boat – 1st. test.first test of a scratchbuilt from printable plans cabin cruiser.