D23 Expo has a history of showing official models in the WDI Pavilion that show everything an Imagineer added to it, down to patio tables and benches.
From vintage models from the late 1970's of EPCOT Center pavilion concepts like this first pass at The Land pavilion:
To sprawling models of entire new lands and mountain ranges and how they fit into existing park facilities.
You can spend as much time as you want pouring over these models, and they have Imagineers standing by them to answer questions and point things out. At the '09 D23 Expo on Sunday afternoon I was admiring the huge model of Cars Land when a gracious lady in a WDI polo shirt asked if I had any questions, and then she proceeded to walk me through the entire model from one side to another in a broad creative overview of the project. We had a nice little chat and I thanked her. A few minutes later I realized who that was; it was
Kathy Mangum, WDI Senior Vice President in charge of Cars Land.
Doh!