Lafazar said:
EvilDragon made a video where he assembles a prototype case, it should give you a good idea on the difficulty of the assembly. Please keep in mind that it is the brittle prototype plastic, the final cases are supposed to be more sturdy.
True, that's assembly of the case... not a complete Pandora. Don't forget, one of the devs broke their LCD cable during assembly, one dev used the wrong screws and came out the other side of the case, not to mention how easy it is to strip plastic screw holes. MWeston is even going down to Texas to teach them how to assemble it.
If someone is not familiar with electronics, they can fry a board with a static discharge so low that you didn't even feel it. There was a post on how the populated boards needed correct storage so as to not get damaged (remember the pic of the rows of the first 105, it was said they held off on populating the first 1000 for a while because of storage requirements). Not to mention the disassembly process, like removing the LCD cable connections, and other connectors.
The assembly people in Texas do this for a living, and he is still going down to show them and supervise.
It's not just the case assembly, don't forget the internal components... I wouldn't trust the average person to do it, and I imagine the number of warranty requests they would get if too many tried.