Answer to: Is it possible to replace the screen?These screens can easily be found on eBay and Amazon. For the US Chromebook for example, I searched for the model number and LCD replacement like this "XE303C12 LCD replacement" on the Google. Found a new screen with Prime shipping on Amazon for about $45.00 US. Install was as described in the other answer, but I did run into a small amount of adhesive tape on the bottom of my already broken screen and the bezel. I was not to worried about it but it took a little more force than I expected to get the bezel removed.
Answer to: Remove or replace the HD of Samsung XE303C12There is not a hard drive in this Chromebook. The flash memory for storage is soldered directly to the main board. This is a little different from the other Chromebooks that have a stand alone laptop hard drive, or a M.2 SSD drive. Those are (mostly, if not all) the Intel based models. The ARM based models like this Samsung do not have stand alone hard drives.