PEP BB metalworking.sand.shelfbrackets - make a beefy set of shelf brackets

This is a badge bit (BB) that is part of the PEP curriculum.  Completing this BB is part of getting the sand badge in Metal Working.

You need a shelf in the garage to put your 5 chainsaws and a medium sized welder on?  I'm thinking you need some beefy shelf brackets.  Let's make some.

Here's one way to do it:


And another:


Minimum requirements:
  - 2 brackets (or more)
  - must be clearly able to hold 300 lbs each and designed well enough to not rip off of the wall under that load
  - primarily built from metal and assembled with welding

To document your completion of the BB, provide the photos or video (<2 min) of the following:
 - The supplies you're starting with
 - Partway through the build
 - The finished brackets