Unfortunately alot of the mods are done with low skill owners and no documentation whatsoever.
You know how it goes - need a receptacle located at the table so install a power drop hanging out of the ceiling type of thing... Nothing done according to any safety specs.
We all want to make it to our own liking myself included. I did alot of somewhat similar work related system installs so sort of have safety in mind in all I do to my trailers.
Works great for the owner and all is well. Leave the cleanup with the next owners problem.
Roy Ken