Way back when I built a lot of Technic. Not really my own MOCs, but I did buy a lot of sets, especially the big ones. So I have a somewhat vague idea what went into the engineering behind this behemoth by builder Engineering with ABS. But I'll emphasize vague, because even the largest LEGO produced set pales in comparison to this mechanical marvel. Just check out the specs in the bottom picture, it's really impressive. Click through for more pics and specs.