Thanks for your answers...
I just found the master map here. The terrain (especially the ocean floors) indicates that there's no way to use continental plates, so there's that. Good to know.

Very cool that all the topography exists already, though I'm not sure it all makes complete sense in terms of water forms, and there's no coherent tectonic stuff that I can figure out off the top of my head.

What are the expert opinions around here regarding geopolitics? Can we make them up yet, or do we want to wait?