How to get brackets made.
There are many companies online who will make a bracket made for you. Typically they take CAD files and a week later a bracket shows up at your house. Apart from the time it is significantly easier than making a bracket yourself and the end result is far superior. Costs can be reasonable too.
Here are my go to bracket manufacturers
SendCutSend
Requires dxf files and bending etc needs to be entered manually.
oshcut
Accepts solidwork parts files. Bends added automatically.