Isn't it interesting how the camera lies to us. In one of the first photos of this thread, the track behind the loco is definitely straight as a ruler but in the later pic where the ballasting techniques is discussed, the track looks like a dog's hind leg. Just as well we're not using the photos to find faults with the build!!!!!!
I remember this layout from the previous RMweb and I have to say that the ballast painting technique certainly overcomes a lot of issues with the type of material initially used for ballast as the paint will almost completely hide what was glued down - be it stone, crushed walnut shells, or something else. The results are certainly worth the small extra effort. After all, time spent on the track and making it operate and look as good as this is repaid in the future with a more believable operating scenario. I suppose you are preaching to the converted as I am in the middle of laying all my track as I type this with hand cut sleepers, hand laid track and spikes. Oh the dreaded spikes! Only another eleven metres to go! Then I have to work out how to electrify the thing.