This tractor, based on the great design by Juan Esteban Paz, has 67 individual parts.
Click on the pictures and check out how nice this model looks at 100-micron layer resolution. The individual files uploaded are just to show what a few of the parts look like.
Be warned, this model may make you nostalgic for those simpler days out on the plains.
Most parts fit together well enough for small amounts of CA adhesive (Super Glue) to do the job. There are modifications to the rear axle and hubs that allow it to fit together - which may require some cutting or grinding to achieve a perfect fit.