LOL, you two have me in stitches.
You see, all you have to do is wrap up your carbon fiber two-by-fours, to protect them from "weathering", and make a space frame with them. Fill the framework with the pillows described in the link, and fill the pillows with nitrogen.
Make them in the right dimensions, and they will be able to float in Venus' atmosphere.
Then you assemble whatever shape you want, seal it up, and fill it with more nitrogen, a little oxygen, and some ballast, (furniture and garden plants).
Presto! Spare room.