@ossobuco,
I live in a ridiculous place now, but I've lived earlier in two places I owned and two, maybe three others, arguably interesting re old construction.
Obviously I'm interested in all this and I got fairly adept in time, but I wish I'd paid attention to my interest in architecture before I got to be 40. But if I had, I probably wouldn't have keened onto landscape architecture, another whole world.
So, back to floors.
You have a tract house. You are changing it to beat the band.
In california, some of the houses in the san fernando valley are now worth millions for being themselves, or so I take it. I'm so old I remember as a child when they were being built.
I once owned three houses in Bakersfield for low investment. That was at about the height of my hating tracts. I went along with husband and advisor.
We sold, as we couldn't sustain commitment.
I read Venturi on Decorated Sheds, which didn't twist my thinking so much as it promoted my twisting.
http://en.wikipedia.org/wiki/Robert_Venturi
Years went by in LA and much multimilliondollar silliness, and playful expansiveness.
It's your house, you are free to do what you want (I did), but I hope you start reading about architecture.