As concept art these graphics are obviously thrilling in that they ooze a very gritty mood and look chilling. However, these days such concept art is mostly used to promote the ideas to big wigs in order to get them commissioned, rather than to be used as a construction reference. So we have no real way of knowing if Alton Towers ever did intend to actually create all the details seen in these graphics. For a start they would have needed a lot more time and a larger budget for hiring set designers/scenic artists and some of the ideas shown look amazing but would be totally impractical (sometimes even unsafe).
And anyway, who wants Holocaust: The Ride? It's sad to look at. Perhaps the most miserable creation ever planned for a British theme park. I'm so glad Swarm's "awesome destruction" theme was a flop, or they woke up and realised people come to theme parks to have fun and not feel like they're about to be executed, or marketing research or whatever caused them to drop this plan, thank goodness. Had this version of SW7 gone ahead, it wouldn't have even looked artistic (or remotely good) because of the way Merlin Studios always stumbles with turning concepts into reality.
Still, it's a fascinating insight into how SW7 evolved throughout its planning. SW7 is definitely one of the strangest ride projects I've come across. I'd love to see more of the new concept art after the more bombastic black/yellow theme took over to see what they were really going for.