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I totally agree with SiliconValleyPirate. (weird, we didn't used to agree on stuff until recently).
This took quite some time, and skill. It was executed very nicely and looks great. The links show a good attention to detail. I bet the author now thinks of this as one of his / her more favorite computers because of the time and energy they invested in it's creation.
We need to see more cool stuff like this, not less.
I also agree with tmtomh. Poorly executed mods, or mods which rip out a perfectly functional Mac to install a PC is sad.
However, they are just computers.