I think your model is still not fully set up correctly wrt the contacts as @jousefm mentioned.
There is for example a beam which is not connected at all to the rest of the structure:
Also the quality criteria of the simulation are currently very low, I would not use these results to draw any conclusions regarding the actual stresses and deformations - there is still a lot to do.
The setup was mainly chosen so you can visually inspect the result to check for unconnected or badly connected parts.
Once all your contacts are correctly set, try to tighten again the convergence and quality criteria to the default values. Then as a final step, use a 2nd order mesh, since a 1st order mesh will underestimate the stresses in your model due to shear locking as you have relatively thin structures and only a single element through the thickness with non-ideal element quality.
Still then, you will probably have certain small regions where your stresses are unphysically high due to stress singularities.