Hey Alexander -
We don't have any documentation around the various images and the dimensions. Regarding the carousel side sizes, they are all 200x200 pixels. Keep in mind, you can upload an image of any size, and the system will attempt to scale the image to fit the 200x200 dimension. This can result in an image that has black bars on the side or top like this:
Thanks David -
When I asked this question I didn't know the option to customise how the site is displayed was available so it makes sense that there is no set dimensions.