hi, im planning to make a pull up bar in our garage, can anyone help me how much would it cost to make this kind of pull up bar..

here is the website of the pull up bar :
http://www.fitstream.com/articles/how-to-make-an-outdoor-pull-up-bar-a176
materials needed are posted in this website, but i dont have any knowledge about carpentry and stuff so i dont have an estimate on how much this would cost.. hope someone could help me :thanks: