Paul B Technic Posted yesterday at 03:13 AM Posted yesterday at 03:13 AM The versatile LEGO Technic 42121 B Model gets a forestry upgrade! I’ve transformed it into a Forest Skidder, perfect for hauling logs and tackling rugged terrain in style. From Tracks to Wheels The original B Model came with tracks, but I wanted more maneuverability and speed. I swapped them out for wheels, which meant removing one gear from the front axle to allow proper steering clearance. The end result is a smoother, more responsive machine that still looks rugged and ready for action. Body Tweaks Alongside the wheel conversion, I made a few changes to the bodywork. Some panels and beams were adjusted to better fit the new wheel setup, giving the Skidder a cleaner and more proportionate look while still keeping that tough, industrial feel. New Rear Grabber The biggest change is at the back—gone is the standard rear bucket. In its place is a functional grabber claw, powered by a small linear actuator (LA). The claw can open and close with precision, making it ideal for lifting and moving logs or other cargo. Added Tow Point No forestry vehicle is complete without towing capability! I added a rear tow point so it can easily pull my Wheeled Sorter MOC or any of my other custom trailers and attachments. This turns the Skidder into a truly multifunctional workhorse. Final Thoughts This mod takes the already fun 42121 B Model and gives it a whole new purpose. The wheel conversion improves playability, the grabber claw adds more functionality, and the tow point extends its usefulness beyond just forestry work. https://paulbtechnic.blogspot.com/2025/08/lego-technic-42121-b-model-mod-forest.html Quote
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