Wow, you actually created this.....
Well, I guess we might as well make some use out of this thread.
And yes, anyone can join at anytime. And I could see this broadening to a general Iroquoian study thread. In fact, we could start with some Cayuga, Mohawk, or Oneida to start if anyone would rather. (My personal preference being for Cayuga or Mohawk, if not Seneca.)
Anyway, if we're starting with Seneca, we can go through the Seneca Language Supplement
lessons, pulling grammar and vocabulary from the other various resources.