It seems the gpu is soldered on to the mainboard, so its not replacable.
source (in german):
http://www.notebookcheck.com/Test-MSI-GL72-6QF-Notebook.161409.0.html
As mentioned in your previous post, the images are quite small and it would be difficult, to see details, especially on smaller screens. Something like one page per image would be better imo. Apart from that, it looks quite nice.
In my experience, cloud 2 (have the cloud 2 myself) is not worth it. They are essentially the same and the sound quality of the usb sound card that comes with the cloud 2 is inferior to (at least my) onboard sound. So if you have a decent onboard sound, go for the cloud. Also the longer audio jack cable might come in handy if you want to use it with something, that only has audio jack as output.