Will do today or tomorrow ;-)
It really is a basic hinge. I did it more or less like the guy in this Youtube clip, it is very easy if you prepare your stuff in advance:
A Dremel is very handy for cutting the plastic. It was a bit a strange feeling, starting cutting, knowing the only way back is a new panel. For glueing the plexi inside I used 2 component glue (epoxy), seems to hold up well. The hinge is screwed to the car, and to the plexi plate (bolt goes through the plexi plate before glueing to the door, so you can always screw on or screw off the panel again).
For the hinge, test it first (ideal is if the hinge opens up a bit, so the little door doesn't touch the side too much when opening. For this, try first before glueing...
For the cable, I lead it through the rubber of the light, so I didn't have to make an extra hole in the frame, and then from there to a main fuse (style like in a house, can be put on or off), and from there further to a priority box (used for choosing between 240 from the car or from the mains) and a battery charger.