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I managed to build a replacement controller (the original went AWOL 8 or 9 years ago) for this fully-functional excavator that I built around 1997 or 98. The source model is the GHQ kit, and I articulated all of the joints. It has four degrees of motion--the only movement that was impractical was traveling along the ground, for obvious reasons. As I write this, I'm working on an article that will include a video of it in action, plus more photos and a schematic of the controller.
Those look great. What paint did you use to get that metal effect?