This house was built before the war and it was smaller than the post-war houses. However, about a fourth of the houses in our neighborhood were as you described. They were built around 1946-48. They looked similar to ours, but had two bedrooms on the main floor and an unfinished upstairs. Lots of friends lived in them--I loved those houses! I guess you would call them a half-Cape.
Most of the Sears houses in the NW were bungalows built in the '20s and '30s. The sister of a cousin-by-marriage lived in one for a few years. However, I think you are correct that kits continued to be sold until after the war, and some of them probably looked a lot like this. I remember when you could buy ANYTHING at Sears and Montgomery Wards!