Hi Steen (looking at your enlarged photo makes me want to date an Asian girl for some reason)
You have a very tricky skilled job to do there as rolling a hinge is not easy, you will need a drill bit the same or a few thou slightly bigger than the hinge pin.
As the brass is very thin you should be able to roll the cut outs with your fingers and smooth flat pliers over the drill shank to form the roll on each of the two parts, I would try a test piece of old etch sheet if i were you and practice a bit.
Try not to get flats on the roll or they will be a bugger to get out.
If you mess them up then soft solder brass tube to the plates to form the hinge..........Phil.
Mechanical engineer.
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