Most of the models in the Story Book colection have reasonably detailed interiors (the one I built, Roberts Roost, was the first and not as detailed as the others.) I just cut flaps in the back of mine to open the interior up for access, but leaving a wall off should be fairly easy. From what you're describing, I would try the Colckmakers Cozy, it seems like it would be easiest to make the interior open. Here's a link showing the one I built.
Fiddlers Green • View topic - Jobeaux's Storybook Village I shrunk it down to HO scale, so Barbie might have a tough time in mine though!
If you don' any other suggestions soon, you might ask an admin to move your post to the architectural models section, you might get some more looks there. Good luck on your search, and don't forget some pics of the outcome!
Happy modeling!