We have power boat building designs of all types such as power cats, cruisers, and more. view jon boat deck plans & boat cabin plans for more details.. Boat plans for the 15 "i finally finish my 15′ dinghy from your plans. today, my son and i took the dingy out on her first main voyage.. Scroll down this page for many more plans. this a page of links to some favourite free boat plans at intheboatshed.net. they’ve been chosen because they are derived.