Yes, you are correct. I did a 3D model in Rhino 3D (trial version, as it's expensive, but I used it in a high school class a long time ago), then parts in both Illustrator and Photoshop. I did a second version, which is on the back of the flyers, and in high-resolution, which fixes some of the rough bits and matches the details of the hotel much more closely in several places. This will be going online on the web site soon, possibly this weekend.
The 3D model is based on scale measurements mainly from Google Maps satellite view, but also using street view and some photos taken by Will, one of publicity staff.
It heavily relies on transparent PNGs so that the text and some other high-detail parts are lossless. The main bit is a JPG. There are hacks in place to make this work in IE6. I don't have moving elevators yet, but this is an idea for the future. We might limit excessive animation (or animation at all) to something like the info page, as it can be a distraction.