anyone know where i might get a set of plans to build a gravity racer,, other wise known as a billy cart,, want to make it out of steel rather than wood, i know it isn't a land yacht but thought someone on here might know where to find some drawings or plans on the net,, there is one for sale on ebay but want to try and build my own...just an extention of my land sailing i guess,, and yas i have thought of using a land yacht without the sail and mast but it needs to have an effective braking system which most yachts don't have, well mine don't anyway