My goal in designing the pro tunnel was a hull that generates maximum aerodynamic lift in a boat meeting the gt pro weight requirement of at least 650 lbs. (boat. Purchase online, then download start building today! the dillon laker 14: boat plans: a recreational tunnel boat for motors 60 hp to 80 hp. Sjx jet boats inc. is located in orofino, idaho. right in the heart and soul of shallow water proving grounds, as well as the steelhead fishing capital of the world..