I have only seen a few models so far. ROS do a small Hitachi dozer which might be a little small but I think it would make a good conversion. The other models I’ve seen have been Chinese models of Chinese brand dozers but they are 1:35 scale. They might not be as recognizable to Europeans but they look like good big models which plenty of space for strong motors. Check out the Zoomlion Bulldozer on ebay.