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Currently I'm bulding a Lego version of the Case Quadtrac 620 in 1:16. It's mainly built in Studio, but tested several mechanism to make sure things are working as expected. Haven't assembled everything yet, exept the tracks and an early version of the rear frame. I'll likely build it after i finished organising my lego parts (haven't done that for years). Here you can find some early sketches from 2008. Since then (and after a long dark age) quite a lot has changed. Even during the last couple of weeks. For a quick impression, this is the current state: Here you can see some more rendered images and screenshots. My goal is to get as close as possible to the original. That includes function, geometry and look. Planned and partially done is the following: Remote controlled with two SBricks and powered by Legos rechargeable battery box Driven by one or two large motors (hard coupled), speed should match 1:16 of the original max speed (40km/h) Steering done with two small actuators and controlled with one large motor (mainly because of the many pin holes for connecting it to the frame) Suspended cabin Front light Openable bonnet Authentic connection between front and rear unit, means no turn table Oscillation between rear and front unit PTO driven by one medium motor located in the front unit 3-point hitch lifted by two small pneumatic Motorized compressor (Mini Motor 71427, located in the rear unit ) for 3-point hitch Motorized switch (medium motor, located in the rear unit) for 3-point hitch Realistically oscillating tracks Spring-supported track tensioner Suspended rollers (these three rollers in the middle) Optional: Full lightning like the original Optional: Maybe a gearbox, but I'm afraid there will be no space left One of the challenges is to fit everything inside the frame, which is 9 studs wide. That leaves 7 studs. Questions, comments and criticism are more than welcome.