Hi I found a fab pic of a john deere tractor cake on here a while back. I still have the pic on my pc but can't find it on here anymore as a listing to ask the person for tips. I have to make a john deere tractor tomorrow but not sure what size cake to cut it from. i'm doing it with a trailer behind (not high cab on it though). What is the best way to make the wheels - RKT? how do i get the tyre tread in them does anyone have a good way of doing this please? I'm not sure I'll be able to raise the whole tractor up would it still look ok if flat on the board do you think?

thank you so much for any help