I am not sure if this is the real cause of the problem but here goes. First thing I did was create a Sheet Metal rule for your model.
I then converted all your model bodies to components. Next, using the Sheet Metal tool Convert to Sheet Metal, I converted all the components using the sheet metal rule above.
I did a Nesting Study of a couple of components, with 1 ea quantity, and it brought Fusion 360 to its knees! It took every bit of 2 minutes to calculate this. It completed as show below.
I went back and added two more components and the Nesting Study started but then quite. So I do not know if your computer can do better because I do not think a nest of only two components at a time will be much good to you. I have this feeling all the intricate notching has some effect on the efficiency. Model is attached.
John Hackney, Retired
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