LOL unfortunately this bit of the car sort of designed itself. I did think I'd probably end up machining as more than one part and joining, was just hoping to avoid it and trying to use it as an exercise to learn more on the machines at the same time.
In all honesty it's not really as deep as that, quite a bit shallower in fact, but trying to draw it with the tools to hand it looked more like a straight line so I emphasized it a weenie bit