I have a model here for a cover to sit over a wishbone mount (Yellow).  What I am trying to do is cut an opening in the front of the part to allow movement of the wishbone, I have sketched this on the attached image.

I'm not sure which way to go to achieve this, I have tried a 3D sketch to then make the cut but couldn't get this to work.  I've not done much with "lofts" but I am wondering if I can make a lofted cut to achieve this.

Any help pointing to the right direction is appreciated.

Thanks, Daniel.