You can actually get a feel for the 3D model of the Arduino case. Play with the cloud version of the 3D model shown below. It allows anyone to interact with the model without downloading the Fusion 360 software. If you are using a mobile phone, you can scroll down the image to get a link to download the Fusion 360 App or click 'continue in browser' to view it in the browser itself.
On Pc: Use left mouse click to rotate model, press mouse wheel to pan and scroll mouse wheel to zoom in/out
On mobile (in app or browser): One Finger to rotate model, two fingers to pan and zoom in/out
Link to the above image: https://a360.co/2qLagQl
(Link useful for mobile, specially if it is difficult to work with the above image due to small screen size)