I can't imagine NOT making ones own battery cables. That's pretty much the only way to get the correct length unless you bring out a marine electrical person to do it for you...
Regarding the link--This fellow does put together a lovely "how-to" on things.
We do not own the really nice crimper tool he shows. We used our bench vise to achieve the proper crimp. Other differences:
We both crimp and solder the wire to the lug--this does melt close-by insulation so...
We use lanolin grease to wick up into the wire strands;
Then, we cover the joint with liquid electric tape;
Then cover with heat-shrink wrap.
Some folks don't like to solder the joint. Hubby does a great soldered lug, though. Some folks don't like to use lanolin--but it really helps keep corrosion at bay for years. Some folks prefer the glue-y heat-shrink wrap--but we've heard it can fail and learned from a very experienced marine electrical fellow that the combo of liquid electrical tape and heat-shrink wrap can't be beat.