Yeah, it's strange. I can understand the need for a smaller model, and the desire to add some thicker aztec plating for extra detail, but it's completely mystifying to me why they ALSO saw the need to fatten up the rest of the ship so much.
At that scale, there's no real point in making room on the model for Ten-Forward. We weren't going to be getting close enough to see it anyway.
My guess is someone at the top simply thought the ship was too sleek and thin before, and wanted to fatten it up a bit.