What factors are involved in calculating how much compression force is being applied to a 3D printed part between two aluminum strips?

For each additional screw that I add to the above project with a specific torque, say 2ft/lbs, what additional factors do I need to take into consideration to be able to calculate compression force across an entire 3D part?

Obviously, I don't have enough data to solve for anything at this point. I would just like to learn how to visualize this problem with proper maths. (For this project, I am just using the "mor screw, mor better" approach. However, I will need to reduce weight eventually.)

Cheers and take care!