I like the angle braces. I think I'd add extra stability on the bottom with a larger base. Also, add the pull-up bar to the top.
DIY Homemade Squat & Bench Rack
I don't even know what to say about this squat rack... neat? crazy? DIY Squat rack for the win
ESP Fitness Functional Frame1
Transform your garage with the Women's Profile® Home Gym Package. Everything you need surrounds the patent pending Profile® Series Rack with Kipping Bar™. Finan
The 3x3 Profile Rack in blue with weight plate storage and single bar holders.
Folding & Vertical Storing Power Racks and Stands - A Buying Guide - garage-gyms.com
Garage gym ideas
This article has some great ideas for how you can build your own home gym without having to be rich and famous!