If you’re doing end to end series, you have the option to fold over 180deg (old style not so popular now), or fold over 90deg and make series connections on top. Folding over one big sheet of nickel seems electrically and mechanically much better than welding many thin strips. I rarely look at the 10/12mm strips now that I have 25mm on hand.
Oh also have you seen my 3d printed welding guide/jig? *Nutty 100-40* Subsonic Century AVIO mk2 P42A 13s4p