A number of parts are sharpened into functional blocks. All blocks and parts are tied at the walk-behind tractor to the walk-behind tractor chassis, at the adapter - to the adapter chassis. The walk-behind tractor itself is tied to the adapter for ease of placement in the scene.
Corona Round Edges map was used for virtual smoothing. Works well on distant objects.
If someone needs to smooth sharp corners and edges with geometry, I recommend using the Chamfer modifier. With it, you can do this for complex parts in just a few clicks according to the algorithm you specified.