Grimrock

First off I'm doing pretty fine on the story. It is about a doctor who had experiments who went wrong.
The music is going to be taken care of
Its going to be a atmospheric horror mod
introduction
Doctor Marcus Barkhaven the chief scientist of the order of enlightenment has not reported in for his daily duties for a entire month. There have been rumors that Marcus has been working on a strange experiments within his family mansion Barkhaven manor. According to reports Marcus has not even left his home for three weeks. The king has put up a reward for anyone who can bring him Marcus Barkhaven dead or alive, or any information on what may of happened to Marcus. A guild of four decided that they would check Marcus's own mansion.
This mod well be focused on
on a more steampunk style
can anyone inform me how to add a wallset in grimrock

Try experimenting with the editor to see what textures and monsters might fit your theme somewhat, and try coming up with some puzzles on your own. You'll find plenty of help available if you've put in some effort and have good questions.