devout lake
As the name states, a version of Create’s Gantry Carriage except it gives the contraption physics. Naturally, the carriage would loosely slide across the shaft, unless you power the carriage itself, similar to the Physics Bearing. You can pass rotation through to the carriage while moving by partially powering the gantry shaft (fully powering the shaft would completely stop the carriage, and would pass 100% rotation speed to the carriage).
lean tide