I did watch two of the videos but I must say I thought the layout was a bit bland...perhaps it was the low video quality, but it looked like contractors had built most of it and given that it wasn't finished in one area and yet there was no evidence of on going modelling I got the impression that some city banker had said in a deep scary voice, preferably through a smooth obsidian sphere with fire burning inside, "HERE IS £20,000 - BUILD ME A LAYOUT WORTHY OF MORDOR..."
The DCC part was quite informative I agree! At least if you like operating your models to signal blocks etc. or with auto-pilot!
Goedel