Many people say that, but I don't think it's such a great idea. One thing - if you have a good paper model, it's worth building out of paper, and the result can be satisfying. And then when you build out of sheet plastic it behaves different than paper, you would have to make a lot of changes in the design of the kit - making many parts differently - might be that a good set of plans would make more sense as a starting point than a paper model.
Mopar Madness - I'm not so sure about the wheels, but the rest of that John Deere is just a well done paper model, tke a closer look at the photos!
But check this out - this is one amazing paper model:
Of course it has been painted up and weathered.
More here: http://www.kartonowki.pl/modele-galeria/model/5897,ursus-c-330
Thanks for reading and have a nice day
Paweł