The only thing preventing you from getting utilities ran into a steel box is your own ability to run said utilities.
As long as you know basic plumbing/electrical nobody can tell you what you can do in that regard.
If you're planning on running pipes into your house though remember to make sure the ground your container's placed on is higher elevation than your septic tank if you plan on putting a shitter in there. For shower/sink drainage I shouldn't have to tell you this but… ROUT IT TO A FUCKING GARDEN.
So help me god faggot if you don't use that greywater to grow delicious cucumbers I'll fucking knife a kitten.