Well, it is important to understand that the Suebi and the Suebi are not the same thing ;-)

As far as I can ascertain.

The Suebi was a Germanic tribe with subtribes.
The Suebi at large was a tribal alliance/confederation... whatever, of many tribes listed as Suebi by ancient authors and many of them with common material culture. Both the marcommani, Goths and Cimbrii were listed as Suebi tribes.

I cannot say whether I will be able to help with the mod if one ever comes to be actually made, will PM you.

But yes, the situation in Germania was very interesting (and volatile) another idea could be to make a Germania TW mod dealing with that- barbarorum to the limit ;-)