I like the designs of the modern dollhouses pictured above. All of these dollhouses were built from loose build-it-yourself Sunset plans. I'm gonna see if I can talk someone into building a 1:12 version of the 1:6 house with elevator. I rediscovered these dollhouses while "cleaning". Somehow I never did finish.
It's interesting that you can only seem to find 1950's - 1970's do-it-yourself modern dollhouse plans. There is also one dollhouse plan from the 1980's that I know of. It surprises me that despite the increased desire for modern design and diy projects, etc, that someone hasn't currently been pushing dollhouse plans that would appeal to the modernist/minimalist crowd of today.
Images: Things To Make Children, Sunset Book 1974