Welcome to our forum.
The rickety relationship you spoke of, is it with someone who might be interested in (or at least accepting of) polyamory? If not, I would think that would make things more complicated.
Sounds like you've been doing your homework, and have a lot of prospects. I hope you'll enjoy your time on Polyamory.com, there is so much to read and post here.
Love means never having to say, "Put down that meat cleaver!"