@Sylux and Ged Thanks for the opinions. Seems like the middle right will be the one I develop further.
The arms may not be perfect as it was just a quick painting to help me put down some ideas.
Here's a WIP of a mecha caracal. It's my first real attempt at doing mecha type stuff. It's a lot tougher than doing purely organic stuff. I find myself trying to visualize if what I'm drawing could actually function (or at least has the impression of being able to function), which is a real challenge.
Here's the initial sketch that I did from reference of a caracal.