I think it looks more natural than a lot I have seen. I don't have the link anymore but the ones I was talking baout are the "waterfalls": under water that are made with filter floss over rocks. Really cool looking tanks but wouldn't look that way long.
I really think that tanks looks awesome and should be bale to get it to look that way with a little work. If I can get the kind of growth I do with my 10 gallon tanks and lousy lighting I can only imagine what you can do with the proper setup.
As for the reds, low macros, especially NO3 is the key as well as high lighting. Which one is more important, I don't know, yet, haven't had the time or space to set up a proper experiment. I have seen it in both situations so I am not sure which is the "determining" factors. I know I got Sunset Hygro to go red even with high dosing but the lower plant looked terrible.
Great inspiration, it can be done and for those who want to go all out, is a good targeting tank to reach for, even if it does turn out to be a "show" tank.