Hi again Freddy,
Restoration shouldn't be as hard as you think. Like many motorcycle firm as of the time Norman didn't make all their own parts but in a lot from outside firms. For example I know they were using British Hub Company wheels in 1950 as a friend has a 1950 Norman and I would expect your bike to have British Hub Co wheels also.
The first thing to do is gather as much information as you can and the best place to start is at the Vintage Motor Cycle Club library. You don't have to be a member to use their services. You can email them at library@vmcc.net and ask for a list of whatever they can find, catalogues, handbooks, pictures, advertisements, roadtests, etc, etc, and go from there. As I mentioned above I live in Australia and have found them very helpful so I don't think you living in Argentina will trouble them one bit.
Keep in touch, there are a lot of us willing to help if we can.
Cheers,