Update as promised:
Like I said, I have been experimenting with the door hinges. The kit parts are obviously made of plastic and they cannot bear the weight of the doors, causing them to hang after a while. Different fora confirm this problem.
So they need to be strengthened. I chose to recreate the hinges in brass. They can be mounted with a fixture through the door pillar and then attached from behind the pillar, preferably with a small plate and a bolt. This way I can prevent the doors from hanging due to loose hinges.
I compared the kit parts with a parts catalog for the real car and they are quite OK in shape, so I just needed to copy their shape in brass.
The first 2 attempts were no good. Either the shape did not satisfy me, either I couldn't get them aligned properly. With this version I am able to make the doors fit well, and align the hinges against the door pillar and against each other vertically.
In the pictures everything is still dryfit, so alignment is nihil, but I can get them algned when attaching and fixing them easily.
This is how the upper hinge looks like, on the left of the car in position for opened doors:
... and closed doors:
The one on the lower left:
And with the doors dryfit into position it looks this way:
Detail of the hinge, as you can see it is a quite simple shape. On the right a complete hinge:
Then the different parts as they are awaiting to be cut to size and soldered together to make the hinges for the right hand side of the car:
Questions and/or remarks? Be my guest.
Enjoy!