Unless you are trying to do some really custom stuff or are looking for an activity to fill time, I'd look at using some inexpensive home design software rather than tackle the project in SWx.
The stuff that I used ( was a few years ago ), was $200-300, quick to learn/use, contained regional building code information, and several hundred textures provided by materials manufacturers. The rendering engine was 95% the quality of PW but rendered in 5% of the time that PW needs. The sofware was simple enough to use that even if your wife had no experience in engineering/cad, she should be funtional in it within a couple hours.
Sorry that I don't recall the name of the software specifically, but I've seen similar looking products at best buy, office max ect.