I think that anyone in this forum would have to admit, that in 95% of the cases, there is no way that one could, in a few hours, have the whole house solution set up and running, with media center, security, telecom etc...
If you only use proven supported equipment, then sure, no problem, if however you decide to toss in a GeForce 8400GT or use the 0710Beta3, then you should not expect to be able to do this.
The video is made by Paul using some Fiire equipment, and some other stuff. But it was also the hardware LMCE is written for, so it should of course work.
There is a few things not mentioned in the video though. for instance the need for two NICs, LMCE setting up as a DHCP server, pluss other points, but those can be easily found by looking trough this forum or the wiki.
It's not like VistaMCE works on all hardware either, not even supported hardware at times, then again, this is not a simple Media center either.