i built this over about a week because i used my pure power tractor as te basic frame. this skidder can do almost anything forest wise and more. i used my gears to power this machine and desined carefully to make it perfect. this is my favorite lego tractor that i have ever built. its grapple has enough power to drag 8 trees at a time up hill in the mud. the driver sits in an airconditioned cab with a stereo and more. it has two seats inside to bring a friend. this is the ultiment machine.