Yeah, that's what I'd meant with the 2x4 thing. I hope I can get ductwork in there. I have common sense, but very little construction knowledge/skill. My ex-wifes dad is a contractor, though. Might be able to draw on his knowledge to do it.
I'm trying to figure out what finish I want, too. I'd definitely like something lighter. I found
this and think I like it. I'm most concerned with getting the living room done. I will insulate the open areas that don't have ventilation ductwork in them to help. I have to assume that it is concrete underneath.