I'm putting together a 10' beam Nacra 18 Sq Meter, and the traveller track is missing from my rear beam. This seemed a great opportunity to explore a curved track - so, what do I need, and can I buy it, or do I have to make it? Should it be to the radius of the boom length, or a bit tighter to induce twisting (or is it to continue to force rotation?) Or should I just get another straight track? I have a new Ogletree-drawn Ullman-cut squaretop with a 30' luff coming in a month or three, if that makes any difference. Anyway, any information is greatly appreciated.