He probably got too many hits and used up his allowed bandwidth. I was able to view it just now or it could have been down for some reason.
Anyway, glad to see Im not the only one with this idea, although my concept includes a full working model of the train on a special mars table. I have the benchwork started on the table but that is as far as I've gotten. I intend to use S-Scale which is the equivalent of 25mm and build a false shell for the locomotive to make it appear bigger. Unfortunately real life got the in way of my hobby and I had to set it aside for a while. BTW, I designed the table and terrain so that it can be broken down and transported. Once I get it finished, I want to be able to cart this thing around to various cons and stores for exposition. Total size will be five feet wide and eight feet long.