I'm about to create the most advanced feature of my life, and am not really sure how to do it. I'm designing a case for a product that will be clipped inside of a closed box. The clip must exit the box (going above, and to the left of, the part, if viewing it from the outside of the box). The clip then must hug the box at a diagonal. I've attached a sketch attempting to depict what I'm talking about.

To add to the complication, things you don't necessarily have to address in your answer:

• The clip will be removable from the main part
  • Eventually will have to be isolated and have a mounting feature added
• The clip will be hollow in the middle
  • injection-molded as two pieces with a wire running throughout
• The clip should be as structurally-sound as possible
  • being able to adjust the minimum thickness, to play with it, is optimal

My best idea so far is to create a plane at the angle I'd like it to come in at, extrude up from that plane a feature that goes a good amount of the way around the body, then spline from the edge face that I create to another face I create on the part. This spline already sounds a bit complicated to me. I'd then take this feature and extrude a cut into it, shell into that extrusion, and in this way create the two parts that I need. I'd also hack the body of the part away to create the mounting feature. 

Before I go too deep, I figured I'd tap into the wisdom of the community.

I appreciate any help at all in the right direction!!

Thank you,
Eric