Hi, I took the .jpg file from your s.kp file. I cleaned it up in photoshop (to remove all .jpg compression artifacts). Then opened it in illustrator and used the automated trace feature. Then simplified the linework automatically in illustrator and exported as a .dwg file. I imported that to SU and ran makefaces on it. So now it is a pretty clean SU drawing. Hope that helps. I can explain that whole process in more detail if needed later, just no time right now. The whole thing took about 5 minutes.
Chris
fllorplan.skp