If you want to cut strait lines and have an angle grinder get some slicer wheels for it. They are the best thing since sliced bread. (airgas pn 64000806) I gave you the pn if you aren't sure what they are. A plasma will do it, just remember you get a hardened zone around the cut.
I don't do anything fancy like that, as I much prefer a narrow tang design. That comes with its on issues.
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