I have a suggestion that comes from personal experience. “allthread and nut spacers” have a rearkable tendency to work themselves loose over time. I would recommend that you consider removing the middle nuts, adding a real spacer over the threaded rod, and replacing the outer nuts with nylock nuts, or at the very least drenching the thing in loc-tite.
Thanks for the suggestion. That pic was taken few week ago. I believe now that it’s different.