Here is an example of the tools and parts I would use to build another cable:
Mix and match as you please. I selected items as examples that would be adequate but there are plenty of different brands etc...
If you've never soldered before, checkout some youtube videos on how it's done. It's not hard at all.
The heat gun is for the Butt Connectors. The ones I listed have solder in them already.
About the only other thing I would suggest is a tube of dielectric grease for coating connections before applying the shrink tube.
Hint: Don't forget to put the shrink tube over the wire [before] you have affixed the connector. You will probably forget anyway... but maybe only once.