I installed the kit today.
It wasnt too hard, sadly I dont have much photos but I can give a full detailed explenation up to the wiring level with the back light.
I couldnt take much photos as i only had my phone with me at the moment, and a friend came to look how I do it..so i didnt notice i barely take photos
First thing to do is open the back door, and take off the carpet, this will reveal the spare wheel.
There's a plastic that covers the trunk "enterance", right where the latch for the door is (the plastic surrounds it), it can be lifted up very easily. there's like a tiny pin that holds it at the buttom, if you look down you can see
how to take it out.
once its out, you see two square filters, which is pressed aligned at the same position of the license plate. its sitting there tight with like klips, you need to hold it carefuly, push a little towards your direction (like into the rear bumper, which is to your body's direction), but be careful not to let go because it can fall down inside and you'll need to start looking for it

once you managed to push it, rotate it in such angle that you'll manage to take it out of the bumper, or towards the front seats if it makes it any clearer.
put it in the side at the moment.
from the two square holes you now see, its easy to take the wires into the trunk once you drill in the bumper.
those squares are big enough to push your arm inside, till the elbow if you're in the right angle.
now, once we have access to pass the sensors wires, lets start drilling...
I decided to treat the bumper as 114cm long, so it wont be too much to the sides, where the plastics get a big short and i didnt want to screw up with the holes.
if its 114cm long, so the distance between sensors is 114/3=38cm. it causes the most left / right sensors be at the middle of the red light reflector. the easier way will be taking a line directly from the back door latch, mark it and take 19cm in each direction, and then another 38 in each direction. mark it carefuly. for the actual drilling, the best is to press down the driller on the place you wish to make the hole and only then press the power button. because its plastic it will go right in with no mistakes.
I took a photo after finishing this stage:
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Once we have the holes ready, you can press down the sensors and take the wires into the trunk. just pass the wires through those plastic square filters you took off earlier, and bring it back to its place. I took extra caution and took all the wires and holded them together with the license plate wire, so it will be tight enough and wont fall down somewhere near the exhaust.
The second part took me a few minutes till i solved it out. of course, we're talking about the electricity part.
I dunno if in UK/similar the reverse bulb is located in the left or right, for my car its on the right.
Disassemble the lights is very easy, all you need to do is open the trunk, and see that right where the light is, theres a plastic switch, you just rotate it till it gets loose and push the light out with your hands. be careful, it has one klip on its buttom-right, so if it feels stuck, which is what that happened to me, just take something thin and push it inside so it'll lift it up a little, and then it will get out for sure.
the light is connected to a set of wires with a klips, just press and pop it out of its place, it will go out fairly easy.
there are 5 actual wires and one extra hole in the plug, and they're all marked with numbers (its written on the plug itself).
When I got to this stage, I disassembled the left light too and saw that number 4 isnt plugged, so I assumed its the one which is the reverse light on the right, and indeed it is.
Number 4 is the positive wire, and number 6 is the minus, which is one wire for all the bulbs there.
Number 4 / + is a green-blue wire, and 6 / - is brown.
You should expose a tiny bit of each of them somewhere in the middle of the wire.
Now we need to pass the power from the control box to the rear light. this isnt a hard task either. First, we need to take one of the screws in the trunk out. The trunk is equipped with 4 'rings' for the safety net, this net hooks are attached to four such rings. you need to remove, of course, the one which is located near the rear light. its a big-size torx screw, but I managed to remove it with regular | screwdriver. once its out, you can carefuly lift the carpet cover from its corner, push your hand inside, and from the top part of it, with your second hand, push the power wire (the side with the plug, of course!) through the tiny hole in the carpet around the place where you removed the rear light switch earlier. push it until you catch it with your second hand at take it down to the part of the spare wheel. the other side of the wire push through the hole you have there so it'll join the electricity wires. now just wire it up..the red wire with the +/number 4/green-blue and the black-red with -/number 6/brown wire. make sure to isolate it well in case of water. now its a good time to test the system and plug the electricity to the control box, attach the lcd /buzzer and turn the switch on and push the gear knob to reverse, see that the system powers up, if not, you must have screwed up earlier

Now, gently push back the light to it place and put the switch on, twist it so it catch the light hard enough. make some order with the wires and hold then down with something tight, so it wont get loose. I placed the control box near the spare wheel with a two-sided tape, so it sits tight and seems like a very clean work. you can now also bring back the safety-net ring and put it in its place, together with the plastic cover (the one around the door latch)
The last part will be to take the sensors display from the dashboard back to the trunk. that is also not a difficult task. I installed it in the driver's side.
What you need to do is first take off the fuze cover and the side cover, once both exposed, place the display somewhere you wish and press the wire into the small gap between the dashboard and the window, there's a gap there, big enough for the wire. once inside, just take it all the way down through the side-cover you took of earlier and press it always inside the plastics, its very easy and can be down with you fingers. I just took it this way through the plastic on the floor-side, till the belts area, and from there on the side of the seat.
Somewhere at the area of the back speaker, i couldnt put my hands inside because it was too small for me, so the wire can be seen with eye but can barely be reached so i dont worry for any damage to it from the kids or anything similar.
Now just take the seat off (just try to lift it) and pass the wire beneath it, then push it through the gap between the back of the seat, and Wallla! Its in the trunk. just take it nicely all the way to the place of the control box and connect it.
I didnt had time for some photos or deep examniation of things, Its just a few hours since I did it.
I also took this photo:
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each one from my family who saw it thought I installed it in some expert place, it looks very good and also working very well. doing reverse is hard in some conditions because of the shape of the car, I dont have any feeling of the distance because of that.
The kit I bought cost 15$ in eBay, and seems to be doing the job very well. We'll see in time how it lasts and its liability.
Since the low cost, I will order another kit for backup, just to have the spare parts...for this price, cant argue with it.
Anyway, I hope you will find this data useful, Im supposed to be asleep right now

For any more questions or photos, please ask away and I'll try to do my best.