Design your own hull using cad

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While ewandering around looking at some yanks tug boats I ended up at this site that has freeware, cad designing a hull .It works give it a go ,the third file took a few attemps to down load but still got it now .
http://www.boatbuilding.com/Projects/more5.html
this one of the best sites apart from the real tug site that is, I followed the link to
http://www.nauticalfollies.com/
you'l find link's from there or if your lazy
http://www.bateau.com/free/Shareware.htm
Mick

http://homepage.ntlworld.com/boats
extrawler steel only, wanted but v/cheep or do swap for tug