LEGO MOC 42121 Quad by PangolinBricks | Rebrickable - Build with LEGO
Turning lego set 42121 into a crawler crane, I'm waiting for more parts, but this is what I have so far! : r/legotechnic
LEGO MOC 42121 C-Model - Tracked all-terrain vehicle by stily | Rebrickable - Build with LEGO
Amazon.com: LEGO Technic Heavy-Duty Excavator 42121 Toy Building Kit; A Cool Birthday or Anytime Gift for Kids Who Enjoy Construction Toys; The 2-in-1 Design Gives Hours More Building Fun, New 2021 (569