Please could anyone tell me how I would make a John Deere tractor.

check out my pics i just made one for a cake. I used styrofoam, im not good enough to use rkt yet!! I made the main square and the top square as well as the rear end and attached them all together using rods. I covered each in melted white choc tinted to green before attaching togethr. i then used fondant to accesorize the decals. the wheels are also made out of styrofoam covered in fondant. Since i did use styrofoam i did make sure that i covered the bottom with a cake board so it would not touch the actual cake. Hope this helps!!!