i just started on it but this will be where ill post pics of the process
the subject for experimentation is a Revell C5 coupe with lambo style hinges keep your eyes on this thread
tools needed for this job
Needle nose pliers
Nylon thread or Scriber
File (coarse)
the doors have been cut out with sewing thread

or you can use Flys scriber method which ever suits you best
unfortunately i messed up took a pic of the wrong door..
Heres the vette with the right door cut off. File as neccesary you will do a lot of filing to make a good fit.
This is the demo hinge i made it should look like this but 1/24 use the pliers to make(adjust as neccesary)