This was just something I tried quickly in MoI, to point out to someone that having MoI in one's CAD toolbox comes in handy on occasion for things like this. I am afraid that I don't use MoI very often, so I forget much of what I learned between uses. This was from a discussion on the TurboCAD forum where the fellow was asking for best method to make this hook. We can do Loft with Guides in TC, but guides are poorly implemented there so of little use. MoI has good implementation of Loft and Sweep with guides, so thought that would be better for this hook. I thought that leaving the right side hole out of the mix as well as the little tongue would be the way to start. The 3rd image is a similar hook I found as a bit of 3D reference. It would be great to see how you would approach this, but only if you have the time and feel like it.