Hi Mateusz,
Looking at the model, you can solve the model using 2D elements by extracting the midsurface of the 3D parts and the pins can be modelled using 1D elements. For a preliminary analysis you can stick with the use of linear materials and linear contact definition (bonded).
You may find these Ansys Innovation Courses helpful to learn more about modelling in Ansys Mechanical.
/courses/index.php/courses/geometry-representation-using-ansys-mechanical/
/courses/index.php/courses/connecting-parts-together/
Hope you find this helpful.
Regards
Saurabh
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