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. While the tunnel boat derives much of its high performance from air lift, it depends at the same time on its planing interaction with the water to maintain a stable. Free study plans for the tortuga mullet skiff. our study plans are two of the actual construction drawings. they’re not enough information for you to build the boat.