theres one over here, but its an old plan, would scale up, then there is this one, from the states
http://www.laser-design-services.com/ai ... d_plan.jpgthis is the plan from a laser cut kit, so may enlarge, and not need any extra work, structure wise, and may will be ready for a laser cut kit from the enlarged plans, certianly looks to be a lot of wood in it, a whirlwind would be a superb model to see on the circuit