Here is the stainless steel mounting blank. I outlined where I wanted my opening and where I wanted my box to sit. I then used a Dremmel cut off wheel to score the opening. Then I was able to punch it out with a little pressure. Next I took a grinding wheel and smoothed out the edges and got rid of the burs.

You can also see where I drilled through the blank to accept the 4 little stubs that the project box has. Also above each hole you can see where there is a nut. This nut corresponds to the bolt on the inside of the box that attaches the box to the blank. What is really nice about this box is that it has all the holes and stuff pre marked. Kind of like it was meant for this