I don't know if I would mess with making
distro's unless your a certified electrician... there is way to much liability. If you do decide to build it yourself, I would make sure you have a electrician look at it. The last thing you want is a huge lawsuit on your hands because you killed someone or burned down a building. Even doing something as "simple" as tie-ins can result in disaster. Working with 400- 600
amps of power, you do one simple thing wrong and you dont have to worry about showing up to work the next day because you won't have a job or even be dead. Power is nothing you want to mess with, Even as many times as you may work with it you never should be to comfortable because then you get lazy. The stories I chould tell about electricians with over 20 years experiance killing themselves.... not going to go there. Just keep it in the back of your mind at all times.