In general, if you want one or two batteries, it’s not worth it to build them. You can find very capable folks here that can do it for a fee. The end result will be safer, cheaper, and more reliable than a first or second build.
If you want to become a battery builder and invest in the tools and shop needed for that, then it’s advised not to cut corners. At a minimum you’d need a good welder, like Kweld or Malectrics, and definitely follow modern 2024 advice when received from other builders. There are many outdated ways to build batteries that aren’t used anymore for reasons. Stacking nickel is one such thing that used to be common and is rarely if ever done anymore.