Purchase online, then download start building today! dillon pro tunnel: boat plans: tunnel boat for gt pro racing or motors to 40 hp. View tunnel hull boat plans for the seabright 21, a shallow draft, atkins style tunnel boat. see our plywood version of this tunnel boat design at bateau!. Tech support. the best technical support: we will help you succeed! all our plans and kits come with full technical support. ask questions on our support web site.