Hi Matt,
Glad you like my humble little site! No format required to post here, the more that take part the better!
Good new and mainly bad news for your question. The 1200LE does not have enough NOR space to support all of the Blazer 5 features, one of the features not in there is CSG. 🙁
There was a network boot version for the 1200 LE floating around but I am not sure if this is continued. The net boot code was downloaded each boot of the terminal as it was to big to be stored locally.
Long story short, you will need 1125’s or the S10 to support CSG,
Cheers,
-TT