But how do they assemble the thing together in the factory if you can't undo it without causing permanent damage?

Love the Back to The Future easter eggs through the teardown!

Next time just search on Google or Wikipedia:

http://en.wikipedia.org/wiki/Advanced_Fo...

What's underneath the heatsinks?

I also believe the bootrom and the device's udid are also stored it that area

The reason that the CPU is soldered is because Intel doesn't offer any socketed CPUs with the Iris Pro GPU. So Apple is forced to use the soldered processor instead

Old motherboard:http://www.homebrew-connection.org/imgs/...

It looks like that MS just altered the port layout of the corona pcb

This might help you: http://www.ifixit.com/Tools/Screw-Extrac...

If it's too expensive for you, grab a pair of pliers and try to twist the screw

The ram in the 27' model can be removed much more easily.

Made in USA reminded me about the original Macintosh

There's also a extremely small die near the gpu.I am sure it is a northbridge/southbridge combo.