As a judge for Lifeslover's Build to Plan Contest, I decided that it would probably be wise to follow a plan myself. I figured it would allow me to be a more fair judge (how can you judge a building contest if you have never built?) especially when it comes to the CC limit and using what you have and the building constraints. So, here are the fruits of my labor:
The house is Plan SHD-SEA259. The plan states there is a crawl space or a basement available for the plans. As a crawl space is useless to sims, I went with a small basement. There were also two options for the back of the first floor (I used the second option and then melded them together in Gimp to get the correct floorplan). The optional loft has also been utilized.