Looking at the configs, all parts have an inverted "node_stack_bottom" normal: In ALL .cfgs, juts change the value highlighted red: node_stack_bottom = 0.0, xxxx, 0.0, 0.0, 1.0, 0.0, 2 to: node_stack_bottom = 0.0, xxxx, 0.0, 0.0, -1.0, 0.0, 2 This will allow attachment to the lower node.