Electronics tower for 3D-Printer (here Tevo Tarantula)

THIS IS STILL UNDER CONSTRUCTION.
This is my current project on making my printer safer and quieter:
The problem was the sheer amount of cables hanging around the printer, making it a nightmare to change anything on them. I also noticed the original power supply putting out slightly wrong voltage and being very loud (it simply lost my confidence).
So I started looking for safe and affordable solutions to this issue. ATX power supplys are very common for PCs, safe and affordable. They also come with the benefit of a sleep-mode pin. This can be used by octoprint.
For your ATX choice:
• Go with a good quality brand and at least +60% power
• Make sure that all rails and plugs are specifically explained in a manual
• Power-supplies without cable-management are cheaper but are a mess to deal with. Most cables don't get used.
A very helpful website was to me: http://www.instructables.com/id/A-Makers-Guide-to-ATX-Power-Supplies/
Warning:
• Don’t connect different power-rails
• At