Senko, I think your list is really helpful for newcomers to the game. It also seems to work nicely with the current rules on SINs. Maybe some additions or modifications, though. I don't think there would be full corp SINners that do only unskilled manual labor. You can only acquire full corp SIN status by birth or at least being born into the corp, at least in SR5. And this means your parents must have been either full corp SINners, too, or worked their way up so far that they were promised to have their childrend granted full corp SINs. Maybe this status is also attached to certain conditions like scoring high on a pre-school IQ-test. Why else give away full corp SIN, if not to a future leader? Full corp SIN means full rights, propably (minor) shareholder status and definately a life in bliss. Not luxury, but top notch education and the chance to get everywhere in the corp. If you work hard enough, of course.
Maybe full corp SINs could also be earned at retirement age for very succesful workers. The golden wrist watch of the SR-universe. This would be like setting slaves free in ancient Greece and Rome, making them quasi-citizens and their children full citizens, although stigmatised as "homo novi", as newcomers.
Limited corp SIN however means, you valuable enough to the corp to get noticed. You are an asset that they would like to keep. Either you were born into the corp, but your parents were never succesful enough to achieve full corp SIN or you were recruited from the outside world. The national systems produce high quality brain, too, at least sometimes. So the corps will buy them from the open market like today: Like what you do? Earn more while working for a AA corp and earning a risk-free pension and a safe education environment for your children.
National SINners on the other hand have pretty much all the options they do today. They will have to work more, there will be more strings attached to everything, but you can work as a wage slave in a corp and hope "to be noticed" or subject yourself to the unsafe job market of the non-corp world. That ist small and micro-business and of course public offices that have not been privatized. The job markets will be less safe, with more hire-and-fire because of failing businesses, but the workload will be less than wage slavery. You will not own a pension in small and micro-business, but you will in public service. It will only amount to Low Lifestyle, but it'll be yours. Unless there is a crash or something.
Then there are the SINless. They are practically like foreign laborers used to be in the early apartheid in South Africa or later black workers were in general: You live in a really bad part of your sprawl and if you leave it, every ID check will alert the cops. Basically you are a fugitive all your life, an illegal. I cannot imagine that in SR, where up to 30 percent of the people are SINless, these all become criminals. There will be a lot of unlicensed business, shebeens, fleamarkets, backalley shops or whatnot (look into a township in South Africa), but even grey economy cannot thrive on criminals and fellow grey businesses allone. This would make the SINless economy have a 100 percent import deficit. So SINless need a way to earn money, but not work inside the SINless community. Much like illegals work illegally today as domestic servants, nannies or construction workers and whatnot. SINless might even get a "work pass" (again borrowing from apartheid South Africa) and work cheap manual labor for a corp. This would be even lower work than wage slavery. No paper pushing, no bolting together parts in a factory, but cleaning chemical waste in disposal sites or anything similar that gets you killed in no-time (think Elysium here). These migrant workers get shuttled from the Barrens to their working site by bus and receive payment daily after work (hopefully). Thus they avoid ID checks and provide a limites cash influx into the SINless community.
Chances of rising up into the world of SINners are almost non-existent however. Outside your grey economy you are a pariah, inside you are a milk cow: Your outside-earned cash lets you buy goods inside the grey and black economy, but you can never save up enough money to start your own business. Exceptions are rare and entirelly dependent on luck. The only SIN regularly earned by those unlucky, is a criminal SIN, making it even worse. Now you're branded for life. After doing time, you might own some favors to the real criminals, pulling you even further down into the criminal life. Even if you manage to stay clean, being a criminal SINner means, you have to pay taxes, but cannot find a job. You're forced to project your criminal SIN all the time, so the illegal transport busses corps use to shuttle you to the hazadous work sites, won't pick you up. Unless you find a job inside the grey economy, you will have to become a full blown criminal to provide.