Bored today so I got the jigsaw out on a bumper I picked up yesterday and digged out the marker lights I brought a few weeks back.
I had already made a template using the marker light as shown.

Using this and position it on one side of the bumper I then traced the wheel arch curve and the swage line to gain a horizontal and position mark so both lamps are exactly the same both sides.
I then got out the orbital sander and cleaned up both areas and using a red bic pen I marker out the shape on both cleaned areas. Jigsaw time!!!
Slowly cutting and trying not to cut through side mounting brackets, best to drill a starter hole towards the front of the light cutout area and jigsaw towards each corner so that when you cut along the outer lines you have somewhere to aim for and makes it easier to remove each segment.
I haven't bonded them in yet but this will allow me to tidy up the edges as jigsaws are a little random with plastic when your trying not to cut whats behind!!!

