I used the terminal block because I felt it was cleaner, and let me take all the wires to one central place if I ever need to troubleshoot or replace something. Using wire nuts is certainly another way to go. it just wasn't my preference. Plus, I already had the terminal blocks from another project.
I cut the openings with a dremel tool and filed them. There are probably better ways, based on You Tube videos that I have watched since doing the build.
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