Well the truth is, and I've built homes for over 15 yrs , Unless you need structure and or by code , yes your 2 x 4 spacing will need to be either 16 or 24 inched spacing , followed by either 1/2 or 5/8 Drywall . But if you don't have to worry about load which you dont , there is not need for proper/code , and you could save money by simply spacing your 2x4's out more and using panel board and or just wrap and staple exo with pand film or Mylar drapes.
We all can learn anything , from the internet. But most people fears stop them from succeeding.
Now when it comes to electrical , that shit is nothing to play with, sleep better at night.