Here are some pictures from my install of the new Calpac on my IA1. It took about 30-45 mins to install. It would probably take half that time if I were to do it again.
As you can see from the pics, the bottom section is the same size as the old model (old left, new right), but there is more capacity because the top is larger. Sorry about the pics. Can't figure out how to rotate them.