Not to ask the obvious but did you ask Bellsnbows? If I did a tractor similar to his , I would use either 13x9, or suare cakes stacked, carve the round parts, ice and cover with the different colors of fondant, for the props, it would all be either fondant or rice krispy treats formed and dried to set.
Hi halleyec, I have just posted a tractor cake in my pictures. Its nowhere near as sophisticated as the one you are looking for, but at least its a starting point. If you want to give 40 people a piece I suggest you put the tractor on a sheet cake.
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