Again thanks for the replies guys. Stubborn as I am, I'll try to wrestle through it myself to begin with, but I certainly keep this course in the back of my mind.
And good that you mention Sketchup. I completely forgot about that one, Making a bunch of rooms and a window was minute work indeed. Though I can't remember if adding slightly more detail like stairs, skirtings, rounded ceilings or beams was possibly. I guess it does that as well.