Really just getting started with it, Muse. The Subdivision tool hates me, though... Did all kinds of weird things to that model

Speaking of, I wound up scrapping it. The mesh breaks badly in Poser, and it seems there were a lot of polys and loose verts hanging around providing substantial difficulties in getting things together. 

Worse, any attempt to fix it was only making it worse. So, after much gnashing of teeths, I grabbed another cube, and began again... Only this time more careful about what got extruded.

The mesh is almost certainly going to be higher-poly at this point, but it's a whole lot cleaner.

I'm going to get off my soapbox now, and let you get back to your day