Re: DIY Tipi build?
In regards to the O.P.'s question, Tyvek is another option for a fabric material that is significantly better cost wise than the other fabrics allready mentioned. While I wouldn't recommend it as the be all end all fabric, it would work quite well as either a prototype material or as a disposable material (ie, plan on getting one season out of it).
Make it your ambition to lead a quiet life, to mind your own business and to work with your hands, just as we told you, so that your daily life may win the respect of outsiders and so that you will not be dependent on anybody.