The doors

So one of the first things I rigged were the doors (or at least I think I did them first.) I did have to change the pivot point as the SLR has gull wing doors so I moved the point to the top of the door so when it rotated it looked fairly accurate. I then made an arrow using the CV curve tool to use as the controller. Then selecting both the door group and the arrow I added a Orient constraint and constrained it to the Z axis so the door can only move up and down.

I the added rotation limits so that the door wouldn't be able to do a full 360 no matter how much I rotate the controller