Henri got a 25ft. It seems 25ft is a great good boat to learn, have fun and sleep some nights in. In Brazil costs likd 30k BRL but 5-10k USD in US/Canada.
Nice one from Roberto: http://www.yachtdesign.com.br/portugues/projetos/mc34/desc34-1.php http://www.yachtdesign.com.br/portugues/projetos/ex39/expl39_1.php
Brief how to on boat design: http://www.duckworksmagazine.com/04/s/designs/morten/designing/Part1.htm