Such an ornament will look good in the garden, among dense non-blooming greenery. The tractor is made almost entirely of wood saw cuts of different diameters. How to fasten all this together, you can find some instructions on the Internet, or you can dream up yourself and try different methods.
A trailer is just a small wooden box in which you can put flower pots, or cut flowers, or planted in an earthen mixture, as the owner wants. As one user noted, it is unlikely that this tractor will work, but it would be nice to make such transportation.
In any case, children will like this technique, environmentally friendly and tasteful.