I Move Heavy Things: DIY pullup Rig / Squat Stand
Homemade Parallel Bars and Pull up Bar - All Things Gym
The Invention Factory: Backyard Pullup and Dip Bar System
World's first portable pullup and dip bar for your outdoor & indoor Freeletics, Calisthenics and other fitness workouts!
and a DIY dip bar! (tenho medo dos canos não aguentarem meu peso).
Backyard Gym Structure [Running Riot...: November 2012]
DIY parallel bars & pullup bar
Backyard Pullup and Dip Bar System | The Invention Factory