Having got a mirror case sat next to me right now, everything other that the led's fitted to the new case would have to come out of the old case. So they will still fold the same as normal! as that is also from the old case.
The only one problem apart from wiring up the lights that I can see is how to get the wires from the case to the door, as the wiring for everything else come though the centre of the motor and I there is no space on the oem case of any others to come from, very hard to explain with out pics and I can't get any on here as I'm using a iPad!