Ahhh, I wish I had thought of an video myself!
I have never done anything with a door before I started on this. I used an old door, took out the lock and just tried understanding the parts and then figure out what had to be done. I actually had a locksmith over, but he said it couldn't be done ??. I knew it could, because my brother had done it already.
Sending a picture of approximately how the dor case looked like.
Since I didn't have the tools, (or the skills), I used a carpenter to do the cutting and so on, - I just had the plan of which steps that needed to be done.