farm equipment models????

ok, ok, I may be going off the deep end with my job here, but I like it and while I'm sitting in my swather for 14 hours a day, I get to thinking about modeling a bit and I thought: hey , why doesn't some model company come out with farm equipment models? people like Rob Gronovius and Redleg can do models of their line of work, so how come I can't? does anyone think this is a good idea or am I nuts? (and no, I do not want to try scratchbuilding an entire swather or combine or tractor)